PENRAY
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Penray Truck Maintenance Products
Penray manufactures a range of chemical maintenance products for heavy-duty commercial trucks, including coolant system treatments, fuel additives, brake cleaners, and diesel exhaust fluid (DEF). Their coolant system products — particularly their supplemental coolant additives (SCAs) and cooling system flush products — are well regarded in fleet maintenance for protecting engine liners and cooling system metals from cavitation erosion and corrosion. For Peterbilt fleet operators managing PM schedules across multiple trucks, Penray provides reliable chemical maintenance solutions that integrate easily into standard service intervals.
Frequently asked questions about Penray products
What is a supplemental coolant additive (SCA) and why is it important for diesel engines?
Supplemental coolant additives (SCAs) are chemical packages added to a diesel engine's cooling system to inhibit cavitation erosion on wet cylinder liners, prevent corrosion on ferrous and aluminum cooling system metals, and control scale and deposit buildup in the coolant passages. Diesel engines — particularly those with wet-sleeve cylinder liners like older Cummins and Caterpillar designs — are susceptible to liner pitting from cavitation if SCA concentration drops below the minimum threshold. SCA concentration should be tested at every PM interval using test strips or a refractometer, and supplemented as needed to maintain the range specified by the engine manufacturer.
How often should a Peterbilt's cooling system be flushed?
Conventional green antifreeze cooling systems should be flushed and refilled every 2 years or 300,000 miles. Extended-life coolant (ELC) systems — increasingly common on newer PACCAR MX-powered Peterbilts — can go up to 600,000 miles or 6 years before a full flush is required, provided SCA extenders are added at the 300,000-mile mark. Regardless of interval, the cooling system should be flushed any time coolant appears rusty, shows significant sediment, or tests outside acceptable freeze protection and SCA concentration ranges. A contaminated cooling system left unaddressed leads to accelerated corrosion and potential engine damage.
Does Penray make DEF (diesel exhaust fluid) products for emissions system maintenance?
Yes — Penray produces DEF and DEF system maintenance products for trucks equipped with selective catalytic reduction (SCR) aftertreatment systems, which includes most Peterbilt trucks manufactured after 2010. Their DEF meets ISO 22241 purity standards required by SCR systems. Using sub-standard or contaminated DEF can damage the SCR catalyst and cause the truck's engine to derate — a costly repair. Penray also offers DEF system cleaners and injector maintenance products for high-mileage SCR systems experiencing deposit buildup.