The Royal Purple 15W-40 Synthetic Motor Oil combines premium base lubricants with proprietary additive technologies to create a product that optimizes engine performance. It delivers superior protection and improves performance in gasoline and diesel engines. This 1 gal of Royal Purple motor oil meets ILSAC GF-5 and Dexos1 performance requirements. No special procedures are necessary when upgrading to Royal Purple. Royal Purple recommends waiting until the manufacturer's first scheduled oil change in new gasoline and diesel engines before upgrading to Royal Purple. This diesel engine oil is compatible with synthetic and conventional motor lubricants. Available viscosities include: 0W-20, 0W-40, 5W-20, 5W-30, 5W-40, 10W-30, 10W-40, 15W-40 and 20W-50 weights. Royal Purple also offers mono-grade motor oils in SAE 30, SAE 40 and SAE 50 weights.

Royal Purple 15W-40 Synthetic Motor Oil, 1 gal: 1 gal of Royal Purple motor oil provides better wear protection: Enhanced additive technology prevents metal-to-metal contact beyond both Dexos1 and ILSAC GF-5 specs Increased fuel efficiency: A low coefficient of friction results in optimized fuel efficiency (the fuel economy of our 5W-30 meets the fuel economy requirements of a 5W-20 oil) Diesel engine oil gives better protection of the expensive catalytic emissions system: Patented ZDDP additives optimize emissions catalyst system life Improved compatibility with fuels containing ethanol: Patented additive technology prevents the white sludge and lubrication starvation that can occur with 20 percent or higher ethanol fuel Royal Purple 15W-40 Synthetic Motor Oil has superior corrosion protection: No rust observed in standard industry testing