Specially formulated for E-10 and all gasolines!

Improve all octane grades, brands, including new reformulated and ethanol blended gasoline with PRI-G, our super-concentrated, Complete Gasoline Treatment.

Specially formulated to protect your engine from issues with ultra low sulfur diesel fuels and all diesel blends!

Whatever type of mid-distillate you are using, diesel #2, MGO, MDO, ULSD or home heating oil, improve it with super-concentrated PRI-D Complete Diesel Treatment. PRI-D is formulated with the most advanced stability, deposit control and lubricity additives available today to afford a maximum range of protection.

Kill algae and other organisms that grow in the water bottoms of diesel tanks with PRI-OCIDE.  Quick-kill PRI-OCIDE destroys microbes fast, and keeps working to prevent further growth of algae, bacteria and fungi. Available only for offshore applications.

PRI-G For Small Engines

Our newest offering is especially designed for small two and four stroke gasoline engines in all types of gasoline, including reformulated and ethanol blended fuels..

One 8 oz. bottle treats 20 gallons.

PRI-RS - our flagship product, protects cruise and merchant ship engines and boilers worldwide from the ravages of today's heavy fuel oils. Independent emissions studies on a diesel motor ship and at oil-fired power plants repeatedly confirms the remarkable capability of PRI-RS to significantly reduce NOx, SO₂, and particulate emissions.

PRI-SOLV Fuel Oil Treatment

PRI-SOLV is the ultimate sludge and stability treatment for the world's worst fuel oils.