Mobil Delvac Extreme Full Synthetic Diesel Engine Oil 15W-40 is engineered to provide superior performance and protection for modern diesel engines, particularly those operating under extreme conditions. This high-performance oil is suitable for a variety of heavy-duty applications, both on and off the highway, making it an ideal choice for vehicles that frequently encounter heavy loads. Its advanced formulation allows for extended oil change intervals, potentially doubling the time between changes compared to traditional oils, thereby enhancing engine longevity and efficiency. The oil's compatibility with both new and older engine models ensures that it meets or exceeds the requirements set forth by API CK-4, CJ-4, CI-4 PLUS, CI-4, and other service categories, providing versatility and reliability across a wide range of diesel engines.
In addition to its outstanding performance in high-temperature conditions, Mobil Delvac Extreme 15W-40 excels in low-temperature environments, promoting better oil flow at startup and reducing wear on critical engine components. This feature is particularly beneficial in colder climates, where smooth engine operation is essential for maintaining performance. The oil's exceptional oxidation stability and anti-wear properties help to protect against corrosive and abrasive wear, ensuring that vital engine parts remain in optimal condition. For those seeking a premium diesel engine oil that can withstand the rigors of demanding driving conditions, Mobil Delvac Extreme 15W-40 is the ultimate solution.
 
Premium full synthetic formulation designed for maximum engine protection and performance.
 
Extends oil change intervals, potentially allowing for up to two times longer usage than OEM recommendations.*
 
Versatile application for a wide range of heavy-duty vehicles operating in both on- and off-highway conditions.
 
Exceptional oxidation stability and anti-wear performance for enhanced engine longevity.
 
Superior low-temperature performance for improved oil flow during cold starts, preventing sludge formation and maintaining shear stability.