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13% Efficiency Rating - Efficiency SAE J1985 3rd-Party Test Results
or blended oils
and with our Maintenance Kits
They block out dirt
NOT hauling
Doc's Diesel 15W-40 Full Synthetic Heavy-Duty Diesel Oil 2014-2021 13% Efficiency Rating - EfficiencyDoc's Diesel Engine Oil: Powered by Hot Shot's Secret the 15W 40 Full Synthetic Heavy Duty Diesel Engine Oil is a CK 4 specification additive package built with synthetic group III base oils, and contains the patented FR3 Nano Technology to provide the absolute best level of protection to your diesel engine. The FR3 Nano Technology infusion provides protection, longevity, and performance gains that other synthetic oils will not allow. Product Details: