Our most popular oil for diesels. Increase power while decreasing fuel consumption. Royal Purple Motor Oil is specially formulated multi-viscosity and straight grades for use in gasoline and diesel engines of all types - from cars and trucks to SUVs, motorcycles and boats. API / ILSAC Certified. Royal Purple Motor Oil delivers superior protection and improves performance in four-cycle gasoline and diesel engines. It increases horsepower and torque, saves fuels and reduces heat, wear and emissions. It has unsurpassed oxidation stability that allows for extended oil drains and fewer oil changes, which saves you time and money and reduces the impact on the environment.

Royal Purple’s performance advantages come from a blend of synthetic oils plus Royal Purple’s proprietary Synerlec technology. Royal Purple Motor Oil is compatible with other mineral and synthetic motor oils. It’s available in 0W40, 5W20, 5W30, 5W40, 10W30, 10W40, 15W40, 20W50, SAE 30, SAE 40 and SAE 50 weights.

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This includes a total of 4 (ea), 1 gallon bottles.