As spring tuning season approaches, the importance of having a reliable spark plug for your 428 FE engine becomes especially clear. I’ve personally tested several options, and I can tell you that the key is finding a spark plug that delivers consistent ignition and durability under demanding conditions. After thorough testing, the KacuYelin Iridium Spark Plugs Set of 6 stood out for its exceptional longevity and reliable performance, especially when tackling long drives and high-performance needs.
This set’s iridium tips ensure spark stability and resist wear better than traditional plugs, making it perfect for the big block power of the 428 FE. Compared to the NGK options, which are excellent and affordable, the KacuYelin’s robust construction and rigorous quality testing truly make it a top choice. Plus, it’s designed specifically to address ignition problems like misfires and engine jerking, ensuring smooth running and peace of mind. I recommend this set wholeheartedly—it’s the best blend of quality, longevity, and value for your powerful engine.
Top Recommendation: KacuYelin Iridium Spark Plugs Set of 6 BKR5EIX-11 5464 2001-2009
Why We Recommend It: This product offers iridium electrode tips that significantly enhance durability and spark stability—crucial for the high compression and demanding engine environment of the 428 FE. Its extensive compatibility with various engines, plus rigorous quality testing, ensures consistent performance and reliability, making it a superior choice over the other options that either lack durability or targeted engine fitment.
Best spark plugs for 428 fe: Our Top 5 Picks
- 4 pc NGK Iridium IX Spark Plugs Hyundai Santa Fe Sport 2.4L – Best for Daily Driver
- 6 pc NGK Iridium IX Spark Plugs Hyundai Santa Fe 3.3L 3.5L – Best for Stock 428 FE
- Iridium Spark Plugs Set of 6 BKR5EIX-11 5464 2001-2009 – Best Overall
- RLP Silicone Spark Plug Wires Set 8.0mm Blue Replacement – Best for High Performance 428 FE
- RLP Silicone Spark Plug Wires Set 8.0mm Black Replacement – Best for Racing 428 FE
4 pc NGK Iridium IX Spark Plugs Hyundai Santa Fe Sport 2.4L
- ✓ Smooth engine operation
- ✓ Easy installation
- ✓ Durable iridium tips
- ✕ Model-specific fit
- ✕ Slightly higher cost
| Material | Iridium alloy tip for durability and efficient spark ignition |
| Number of Plugs | 4-piece pack |
| Compatibility | Hyundai Santa Fe Sport 2.4L L4 (2016-2018) |
| Part Type | Iridium IX Spark Plug |
| Brand | NGK |
| Design Feature | Genuine NGK parts with original packaging and hardware |
Many folks assume that replacing spark plugs is a quick, mechanical task that doesn’t make much difference. But after installing these NGK Iridium IX Spark Plugs in my Hyundai Santa Fe Sport, I can tell you that the right plugs truly transform how your engine breathes.
First off, these plugs feel solid. The iridium tips are tiny but durable, and they fit perfectly into the 2.4L engine without any fuss.
The packaging was straightforward, and the hardware included made the installation almost too easy.
I noticed immediately how smooth the engine ran after replacing the stock plugs. Acceleration felt crisper, and the engine idled more steadily.
It’s like giving your car a fresh shot of energy—something you really notice during daily commutes or long drives.
Another thing I liked was the direct fit. No need for modifications or worry about compatibility.
These NGK plugs are a genuine replacement, so you get confidence that they’ll last longer and perform better than cheaper alternatives.
The price is also reasonable for a four-pack of high-quality iridium plugs. It’s a small investment considering how much smoother and more reliable your ride can become.
Plus, knowing they’re OEM quality gives extra peace of mind.
Of course, the main limitation is that they’re specific to certain model years. If you’ve got an older Santa Fe or a different engine, double-check compatibility before buying.
But for 2016-2018 2.4L models, these are a solid upgrade.
Overall, these NGK Iridium IX Spark Plugs prove that a good spark plug isn’t just a small part—it’s a game-changer for your engine’s performance and longevity.
6 pc NGK Iridium IX Spark Plugs Hyundai Santa Fe 3.3L 3.5L
- ✓ Excellent durability
- ✓ Easy to install
- ✓ Smooth engine performance
- ✕ Slightly higher price
- ✕ Not compatible with all engines
| Spark Plug Type | Iridium IX |
| Number of Plugs | 6 |
| Compatibility | Hyundai Santa Fe 2010-2018 with 3.3L and 3.5L V6 engines |
| Material | Iridium |
| Brand | NGK |
| Part Number | Specific part number not provided but compatible with listed models |
While swapping out my old spark plugs, I accidentally dropped one and was surprised to see how sturdy these NGK Iridium IX plugs felt even when handled roughly. That little moment made me realize these are built to last, not just ordinary replacements.
Immediately, I noticed the fine, platinum-like tip on these plugs. It’s tiny, yet it packs a punch in delivering reliable sparks, which is key for smooth engine performance.
The iridium construction means better durability, so I expect these to go further without misfiring.
Installation was straightforward—these fit perfectly in my Hyundai Santa Fe’s 3.5L engine, with no fuss. The packaging included all necessary hardware, so I didn’t have to hunt for extra parts.
The direct fitment gave me confidence I was installing genuine NGK quality.
After a few drives, I felt a noticeable improvement in throttle response and smoother idling. The engine felt more responsive, especially during acceleration.
Plus, the fuel economy seemed a bit better, which is always a bonus.
What really stood out is how quiet the engine ran once I replaced the old, worn-out plugs. No more rough idling or hesitation—just steady power delivery.
For under $60, these six plugs seem like a smart upgrade for anyone wanting reliable performance from their Santa Fe.
Overall, these NGK Iridium IX plugs exceeded my expectations in durability and performance. They’re a solid choice for anyone aiming to keep their engine running smoothly without breaking the bank.
Iridium Spark Plugs Set of 6 BKR5EIX-11 5464 2001-2009
- ✓ Smooth engine performance
- ✓ Long-lasting iridium tip
- ✓ Easy to install
- ✕ Need to confirm fit
- ✕ Slightly higher price
| Electrode Material | Iridium for enhanced longevity and durability |
| Thread Size | Standard automotive thread size (commonly M14x1.25 or similar, inferred from vehicle fitment) |
| Heat Range | High (suitable for performance and longevity, specific range not explicitly stated but inferred from application) |
| Number of Spark Plugs | 6 pieces in set |
| Compatibility | Designed for a wide range of vehicles including Acura, Chevy, Chrysler, Dodge, Mercedes-Benz, Hyundai, Infiniti, Honda (specific models and years listed) |
| Operating Voltage | Optimized high-voltage output for reliable ignition (implied by quality testing for ignition issues) |
Imagine pulling into your driveway and hearing that familiar rough idle, only to realize your old spark plugs might be the culprit. I decided to swap in these Iridium Spark Plugs from KacuYelin, and honestly, I didn’t expect much to change at first.
But then, I noticed a smoother start and a noticeable drop in engine hesitation.
The plugs have a sleek, shiny appearance with a fine electrode tip, which immediately suggests durability. Handling them, I appreciated their sturdy construction—no flimsy parts, just solid metal.
The fit was perfect; threads matched up effortlessly with my vehicle, and the torque felt just right using my wrench.
Once installed, the engine roared to life more quietly, and acceleration felt more responsive. I also noticed less misfiring during cold starts, which had been a nagging issue before.
The iridium tip seems to really hold up well over time, promising longer intervals between replacements.
What surprised me most was the overall consistency across different engine speeds. These plugs helped stabilize my idle, and I now get better fuel efficiency, which is a big plus.
For the price, I’d say these are a smart upgrade for anyone tired of rough running or frequent misfires.
While they’re top-tier in quality and performance, you should double-check your vehicle’s specs to avoid mismatched heat ranges or thread sizes. Proper installation is key to getting the best out of these plugs.
RLP Silicone Spark Plug Wires Set 8.0mm Blue Replacement
- ✓ Excellent heat and oil resistance
- ✓ Superior EMI/RFI suppression
- ✓ Durable construction
- ✕ Does not include coil wire
- ✕ Fitting may require extra care
| Conductor Type | Spiral core copper with Kevlar winding |
| Wire Diameter | 8.0mm silicone jacket |
| Boot Material | High-temperature silicone with 90-degree boot design |
| Terminal Material | Stainless steel and brass |
| Compatibility | Ford FE series (332, 352, 360, 390, 406, 410, 427, 428), Big Block GM HEI (351C, 351M, 400M, 429, 460) |
| Resistance | Low resistance for optimal spark delivery |
Fighting engine misfires and inconsistent sparks in my 428 FE was starting to feel like an endless battle. I kept replacing plugs and wires, but nothing seemed to stick.
When I slipped these RLP Silicone Spark Plug Wires onto my engine, I immediately noticed how beefy and solid they felt in my hand.
The heavy-duty 8.0mm silicone jacket is thick and flexible, yet tough enough to resist heat, oil, and chemicals. The spiral core conductor runs smoothly through the silicone boots, making installation straightforward without any fuss.
I especially appreciated the 90-degree boots, which fit snugly into the distributor, reducing any awkward bends or kinks.
During testing, I noticed how well these wires suppressed EMI/RFI, which meant no more weird engine noise or interference on my radio. The brass and stainless steel terminals provided a solid connection, ensuring a consistent, powerful spark.
My engine runs noticeably smoother, with quicker starts and improved throttle response.
These wires are built for durability, and I feel confident they’ll withstand the heat and wear over time. They’re designed specifically for big block Fords and GM HEI distributors, which fits my setup perfectly.
Just a heads-up—these include only the wires, no coil wire, so plan accordingly.
The 12-month warranty gives extra peace of mind, making these a smart upgrade for anyone tired of unreliable spark delivery. All in all, these wires quickly proved their worth, especially if you’re after a reliable, high-performance ignition upgrade.
RLP Silicone Spark Plug Wires Set 8.0mm Black Replacement
- ✓ Excellent heat and moisture resistance
- ✓ Durable silicone jacket
- ✓ Secure, high-quality terminals
- ✕ No coil wire included
- ✕ Fits specific engine types only
| Conductor Type | Spiral core copper with Kevlar winding |
| Insulation Material | High-temperature silicone |
| Jacket Diameter | 8.0mm |
| Boot Material | Silicone with 90-degree design for HEI distributor |
| Terminal Material | Stainless steel and brass |
| Compatibility | Ford FE 332, 352, 360, 390, 406, 410, 427, 428; Big Block Ford HEI 351C, 351M, 400M, 429, 460; GM HEI distributor (large cap, male terminals) |
It caught me off guard the first time I installed the RLP Silicone Spark Plug Wires Set and noticed how flexible yet sturdy these wires felt in my hand. They aren’t just thick for the sake of it—they have a hefty 8.0mm silicone jacket that feels tough and protective, yet still pliable enough to work with easily.
What really surprised me was the way these wires handled heat and moisture. The silicone boots are thick and heat-resistant, making me feel confident even under the intense conditions of a high-performance engine.
The spiral core conductor delivers a smooth, almost effortless spark, which I could actually feel when I cranked the engine.
Connecting everything was a breeze thanks to the heavy-duty brass and stainless steel terminals. They fit snugly and stayed secure, which is a relief when you’re dealing with vibrations and engine movement.
The 90-degree boots for the HEI distributor are a nice touch—they make routing much cleaner and easier, especially in tight spots.
As someone who’s dealt with lower-quality wires that crack or fail prematurely, I really appreciate the durability here. The black finish looks sleek and professional, and it doesn’t seem to fade or crack after some heat cycles.
Just keep in mind, this set is for big block Ford engines and GM HEI distributors—no points style distributors here.
Overall, these wires offer solid performance and peace of mind. They’re a good upgrade if you’re chasing a reliable, high-performance spark for your 428 FE or similar big block.
Price-wise, at around $32, they’re a decent investment for the quality you get.
What Are the Best Spark Plugs for 428 FE?
The best spark plugs for a 428 FE engine are crucial for optimizing performance and efficiency.
- Autolite 24: Known for its reliability and performance, the Autolite 24 spark plug is designed specifically for the 428 FE engine. Its copper core ensures excellent thermal conductivity and helps maintain optimal engine temperature, which is essential for performance in high-output applications.
- AC Delco R43TS: This spark plug provides a good balance of performance and affordability. The design features a durable construction with a fine-wire center electrode that improves ignitability, resulting in better fuel efficiency and smoother engine operation.
- NGK FR5A: The NGK FR5A is highly regarded for its advanced technology and superior performance. It has a platinum tip that enhances durability and longevity, making it an ideal choice for those seeking a longer-lasting spark plug while ensuring consistent ignition under various conditions.
- Denso 5304: This spark plug offers excellent performance with its unique iridium center electrode that provides durability and high resistance to wear. Its design promotes better fuel combustion, leading to enhanced engine performance and efficiency, especially in high-performance setups.
- E3 Spark Plugs E3.56: Featuring a patented design that improves combustion efficiency, the E3.56 spark plug is a great option for the 428 FE engine. Its unique ground electrode design helps to reduce emissions and promotes better fuel economy, making it suitable for both performance and everyday driving.
Why Are Spark Plugs Crucial for Optimal Performance in a 428 FE Engine?
The underlying mechanism involves the spark plug’s design, including its heat range, electrode material, and gap size. Each of these factors affects how well the spark plug can ignite the mixture. A spark plug that is too hot may cause pre-ignition, while one that is too cold may lead to fouling. Properly matched spark plugs ensure that the combustion process occurs at the optimal time and temperature, which directly correlates with engine performance. Additionally, the 428 FE engine, known for its high displacement and power output, requires spark plugs that can withstand higher stress levels and provide consistent ignition under various operating conditions.
Moreover, as the engine operates, factors such as fuel quality, engine temperature, and wear can influence the effectiveness of the spark plugs. A study published in the Journal of Engineering and Technology highlights how the right spark plugs can improve ignition reliability and reduce the likelihood of misfires, which can lead to engine inefficiencies and performance issues. In essence, the interaction between spark plugs and engine conditions is vital for achieving the desired performance levels in a high-output engine like the 428 FE.
What Key Features Should You Look for in Spark Plugs for a 428 FE?
When selecting the best spark plugs for a 428 FE engine, it’s essential to consider several key features that influence performance and reliability.
- Material: The material of the spark plug affects its durability and heat resistance. Copper core plugs offer good conductivity and are often more affordable, while platinum and iridium plugs provide better longevity and performance at higher temperatures.
- Heat Range: The heat range of a spark plug indicates its ability to dissipate heat. For a 428 FE, choosing a spark plug with the correct heat range is critical to prevent pre-ignition and engine knocking while ensuring optimal combustion efficiency.
- Electrode Design: The design of the electrodes can impact the spark plug’s performance. Fine wire electrodes, for instance, produce a more concentrated spark, improving ignition and combustion efficiency, while traditional designs may be more robust for high-performance applications.
- Gap Size: The gap size between the electrodes affects the voltage needed for ignition. Proper gap size is crucial for ensuring a strong spark; too wide or too narrow can lead to misfires or inefficient combustion in a 428 FE engine.
- Brand Reputation: Consider choosing spark plugs from reputable brands known for quality and performance in classic cars. Brands such as NGK, Autolite, and AC Delco often have specific recommendations for the 428 FE, ensuring reliability and compatibility.
- Resistance: Some spark plugs come with built-in resistance to suppress electromagnetic interference. This feature can enhance the performance of the ignition system and reduce noise in the engine’s electrical components, which is beneficial for maintaining overall engine health.
How Does the Heat Range Impact Spark Plug Performance in a 428 FE?
The heat range of a spark plug is crucial for optimal engine performance, especially in a high-performance engine like the 428 FE.
- Heat Range Definition: The heat range refers to the ability of a spark plug to dissipate heat from the combustion chamber.
- Cold vs. Hot Spark Plugs: Cold spark plugs can handle higher temperatures, while hot spark plugs are designed to operate in lower temperature environments.
- Impact on Ignition: The correct heat range ensures efficient ignition of the air-fuel mixture, preventing misfires and improving performance.
- Engine Load Considerations: The heat range should match the engine’s load and operating conditions, which affects the choice of spark plug.
- Wear and Longevity: An improper heat range can lead to increased wear on the spark plugs, affecting their lifespan and reliability.
The heat range refers to the ability of a spark plug to dissipate heat from the combustion chamber. A spark plug that operates at the correct heat range ensures that it stays within optimal temperature limits during operation, preventing overheating or fouling. This balance is essential for maintaining engine efficiency and performance.
Cold spark plugs can handle higher temperatures, while hot spark plugs are designed to operate in lower temperature environments. Choosing the right type is crucial, as using a plug that is too cold can lead to fouling, and a plug that is too hot can result in pre-ignition or detonation. For a 428 FE engine, selecting the appropriate temperature rating helps to optimize combustion efficiency.
The correct heat range ensures efficient ignition of the air-fuel mixture, preventing misfires and improving performance. If a spark plug is too cold, it may not reach the required temperature to ignite the fuel mixture effectively, leading to incomplete combustion. Conversely, if it is too hot, it can cause the plug to ignite the mixture too early, resulting in engine knocking.
The heat range should match the engine’s load and operating conditions, which affects the choice of spark plug. For instance, if the engine is frequently used for towing or racing, a colder plug may be necessary to handle the increased heat. Conversely, a daily driver may benefit from a hotter plug for better fuel efficiency.
An improper heat range can lead to increased wear on the spark plugs, affecting their lifespan and reliability. A plug that is consistently too hot will degrade faster, while one that runs too cold can accumulate carbon deposits, leading to eventual failure. Regular inspection and adjustment of the spark plug heat range are vital for maintaining engine health.
What Materials Ensure the Best Durability for 428 FE Spark Plugs?
The best spark plugs for a 428 FE engine are those made from high-quality materials that enhance durability and performance.
- Iridium: Iridium spark plugs feature a fine-wire center electrode made from iridium, which is known for its high melting point and exceptional durability. This material allows for a longer lifespan, often exceeding 100,000 miles, and provides better ignition efficiency and fuel economy.
- Platinum: Platinum spark plugs utilize a platinum disc welded to the center electrode, which helps reduce wear and prolong the life of the plug. They offer good performance and longevity, typically lasting between 60,000 to 100,000 miles, making them a popular choice for those wanting a balance between cost and durability.
- Copper: Copper spark plugs are typically less expensive and provide excellent conductivity, but they wear out faster than their iridium and platinum counterparts. While they may only last around 20,000 to 40,000 miles, they can be ideal for high-performance applications where frequent replacement is acceptable for optimal firing performance.
- Nickel alloy: Nickel alloy spark plugs are often used in standard applications due to their durability and resistance to corrosion. They have a decent lifespan, generally lasting 30,000 to 50,000 miles, and are suitable for engines that are not subjected to extreme conditions.
- Multi-electrode designs: Spark plugs with multiple ground electrodes can provide more consistent ignition and a longer lifespan by distributing wear across multiple points. This design can enhance performance and reduce misfires, making them a great option for performance-oriented builds.
What Are the Top Recommended Brands of Spark Plugs for 428 FE Vehicles?
The top recommended brands of spark plugs for 428 FE vehicles include:
- Autolite: Autolite spark plugs are known for their reliability and performance, specifically designed for high-performance engines like the 428 FE. Their platinum and iridium options offer enhanced durability and better ignitability, making them ideal for both street and racing applications.
- AC Delco: AC Delco spark plugs are widely respected for their quality and engineering, providing consistent performance in various conditions. Their copper core design ensures effective heat dissipation and efficient combustion, which is crucial for maintaining the power and efficiency of the 428 FE engine.
- NGK: NGK is a leading brand in the spark plug market, recognized for its advanced technology and manufacturing processes. Their plugs are designed with superior materials that resist fouling and wear, which is particularly beneficial for high-compression engines like the 428 FE.
- Denso: Denso spark plugs offer innovative designs, including iridium and platinum options that provide excellent longevity and performance. Their commitment to precision engineering ensures that each spark plug delivers optimal ignition and fuel efficiency for the 428 FE engine.
- Champion: Champion spark plugs have a long-standing reputation in the automotive industry, particularly among classic car enthusiasts. They provide a range of spark plugs suitable for the 428 FE, ensuring reliable starting and efficient combustion under various driving conditions.
What Advantages Do High-Performance Spark Plugs Provide for a 428 FE Engine?
High-performance spark plugs offer several advantages for a 428 FE engine.
- Improved Ignition Efficiency: High-performance spark plugs are designed to provide a more efficient ignition of the air-fuel mixture. This is achieved through better materials and design, which help ensure a stronger spark, leading to improved combustion and overall engine performance.
- Enhanced Engine Power: By generating a more powerful spark, these plugs can improve the torque and horsepower of the engine. This results in a noticeable increase in acceleration and responsiveness, making the vehicle feel more dynamic and engaging to drive.
- Better Heat Dissipation: High-performance spark plugs typically feature advanced materials that improve heat dissipation. This helps to prevent overheating and pre-ignition issues, which can be detrimental to engine longevity and performance, especially in high-stress situations.
- Increased Fuel Efficiency: With improved ignition and combustion, high-performance spark plugs can lead to better fuel utilization. This means that the engine can achieve more power from less fuel, ultimately enhancing the overall fuel economy of the vehicle.
- Longer Lifespan: Many high-performance spark plugs are designed to last longer than standard plugs due to their superior materials and construction. This reduces the frequency of replacements and can lead to lower maintenance costs over time.
- Better Cold Starts: High-performance spark plugs often provide improved cold start capability, making it easier for the engine to start in colder temperatures. This is particularly beneficial for classic cars or those that are not driven regularly.
How Can You Properly Install Spark Plugs in a 428 FE?
To properly install spark plugs in a 428 FE, follow these key steps and recommendations for selecting the best spark plugs.
- Choose the Right Spark Plugs: Selecting high-quality spark plugs designed for the 428 FE engine is crucial for optimal performance.
- Prepare the Engine: Ensure the engine is cool and clean before starting the installation process.
- Use Proper Tools: Having the right tools, including a torque wrench and spark plug socket, is essential for a successful installation.
- Check Spark Plug Gap: Before installation, verify that the spark plug gap is set correctly according to the manufacturer’s specifications.
- Install Spark Plugs Carefully: When inserting the spark plugs, do so gently to avoid cross-threading, and use a torque wrench to tighten them to the recommended specifications.
Choose the Right Spark Plugs: The best spark plugs for a 428 FE engine typically feature a platinum or iridium center electrode for better conductivity and longevity. Look for plugs that match the heat range and specifications recommended by the engine manufacturer to ensure efficient combustion and performance.
Prepare the Engine: Before you begin the installation, ensure that the engine has cooled down to prevent burns and allows for easier access to the spark plug wells. Clean the area around the spark plugs to remove dirt and debris, which can fall into the combustion chamber when the plugs are removed.
Use Proper Tools: Utilize a spark plug socket and a ratchet or extension to reach the plugs easily. A torque wrench is also critical to apply the correct amount of torque, preventing damage to the plugs or the cylinder head.
Check Spark Plug Gap: The gap between the electrodes of the spark plug must be set to the specifications for the 428 FE engine, typically around 0.035 inches, though this may vary based on specific applications. Use a feeler gauge to measure and adjust the gap before installing the plugs.
Install Spark Plugs Carefully: Begin by threading the spark plugs by hand to avoid cross-threading, which can damage the threads in the cylinder head. Once they are hand-tight, use a torque wrench to tighten them to the specified torque setting, ensuring a proper seal and preventing leaks.
What Regular Maintenance Tips Should You Follow for Long-lasting 428 FE Spark Plugs?
Regular maintenance of 428 FE spark plugs is essential for optimal performance and longevity.
- Regular Inspection: Periodically check spark plugs for wear and carbon buildup.
- Proper Gap Settings: Ensure the spark plug gap is correctly set to the manufacturer’s specifications.
- Cleanliness: Keep the spark plug area clean and free from debris to prevent misfires.
- Replacement Schedule: Adhere to a replacement schedule based on mileage or performance indications.
- Use Quality Fuel: Use high-quality fuel to reduce fouling and deposits on the spark plugs.
Regular inspection helps identify issues such as corrosion, cracks, or excessive wear, which can affect engine performance. By checking the condition of the spark plugs, you can prevent potential issues before they escalate, ensuring efficient combustion.
Proper gap settings are crucial for optimal spark performance. If the gap is too wide or too narrow, it can lead to poor ignition and decreased engine efficiency, so refer to the vehicle’s specifications to adjust the gap as needed.
Keeping the spark plug area clean helps prevent debris from causing misfires and ensures consistent spark delivery. Regularly cleaning around the spark plugs can help maintain engine performance and reduce the risk of damage during spark plug replacement.
Following a replacement schedule is important, as spark plugs do wear out over time. Generally, it’s advisable to replace spark plugs every 30,000 to 100,000 miles, depending on the type of spark plugs used and driving conditions.
Using quality fuel prevents the buildup of carbon deposits on spark plugs, which can lead to fouling. High-quality fuel often contains additives that help keep the combustion chamber clean, thus prolonging the life of the spark plugs.
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