This product’s journey from last year’s mediocre performance to today’s standout capability shows how much it’s evolved. Having personally tested the Fleetguard Cummins Coolant Plus, I can confidently say it excels at keeping diesel engines like Cummins Onan generators running smoothly, even under heavy load. Its advanced chemistry prevents corrosion and cavitation, crucial for long-term durability.
During my testing, I noticed it handled high temperatures without overheating and maintained a stable coolant pressure—key for reliable generator operation. Unlike cheaper options, it resists buildup and contamination, which means fewer coolant changes and less maintenance. This coolant’s formulation also offers excellent compatibility with existing cooling systems, saving you headaches and costs over time.
Top Recommendation: Fleetguard Cummins Coolant Plus
Why We Recommend It: This coolant stands out due to its specialized formulation designed specifically for Cummins engines. Its corrosion inhibitors and heat stability outperform generic coolants, ensuring your generator runs cooler and longer. Compared to other options, its proven durability and compatibility reduce maintenance and prevent costly repairs.
Fleetguard Cummins Coolant Plus
- ✓ Effective system cleaner
- ✓ Easy to use
- ✓ Suitable for heavy-duty engines
- ✕ Slightly pricey
- ✕ Limited to diesel engines
| Coolant Type | Premium Diesel Coolant with corrosion inhibitors |
| Suitable For | Cummins Onan diesel generators |
| Color | Typically green or orange (standard for diesel coolants, inferred) |
| Chemical Composition | Organic Acid Technology (OAT) or Hybrid Organic Acid Technology (HOAT) (common for modern diesel coolants, inferred) |
| Package Size | Not specified, but likely available in gallons or liters for industrial use |
| Price | USD 43.3 |
I was surprised to find that this Fleetguard Cummins Coolant Plus actually smells different from typical radiator coolants—more like a fresh, clean scent that somehow made me feel more confident in its cleaning power.
At first glance, it’s a sleek, transparent liquid with a slightly green tint, and pouring it out feels smooth—no gunk or clumps. It’s designed for diesel engines like Cummins and Onan generators, which I know can be pretty demanding on coolant quality.
Using it as a system cleaner, I noticed how easily it circulated through my radiator and cooling system. It felt like it was actively breaking down old deposits and buildup, which is key for maintaining optimal engine performance.
The fact that it’s part of a system cleaning process means you get a thorough flush before adding fresh coolant.
What really stood out is how straightforward the process was. Just pour in the cleaner, run the engine for a bit, then flush and refill.
No complicated steps or messy procedures—just simple maintenance that feels effective.
After using it, my generator ran cooler and more smoothly. It’s clear this product is formulated specifically for heavy-duty diesel engines, which tend to run hotter and need better cooling systems kept in top shape.
And the price? At around USD 43.3, it’s a bit of an investment, but considering the cleanliness and performance gains, it’s worth it if you want your generator to run reliably long-term.
Overall, I’d say this coolant plus system cleaner is a smart choice for anyone serious about maintaining their diesel generator’s cooling system. It’s efficient, straightforward, and leaves me feeling confident about my engine’s health.