Excellent
Heavy duty synthetic blend with targeted additive technology for critical component protection in extreme operating conditions and temperatures
Endorsed
35% better wear protection vs. industry standard in Cummins ISB engine test
Controls
Designed for extended oil life in high heat
Protects
Engineered to control wear, deposits and oil breakdown while meeting low emission requirements
When heavy loads and harsh heat put your construction machinery, trucks, farm equipment or on-highway fleets to the test, choose Valvoline Heavy Duty Diesel Synthetic Blend 15W-40 engine oil. Proven to maximize diesel engine life, it’s engineered to control wear, deposits and oil breakdown, while providing enhanced viscosity and oxidation stability. The synthetic blend formula meets API CK-4 performance standards and extends oil life in high temperatures for more miles between service intervals. And it delivers 35% better wear protection vs. industry standards in Cummins ISB engine test, keeping critical components operating at peak performance. Designed with targeted additive technology for engines operating in extreme duty cycles or severe environmental contamination conditions, count on Valvoline Heavy Duty Diesel Synthetic Blend engine oil for superior year-round performance. Approved for use in Ford, Dodge Ram, Chevrolet and more diesel engines.
Proven to maximize diesel engine life
See It In Action

The only one endorsed by Cummins
Premium Blue Full Synthetic provides extreme protection for heavy-duty diesel and gasoline engines, plus improved fuel economy vs. conventional oils.





