MILES ALL SPEC 40W is high performance, straight grade, heavy-duty engine oils that combine selected base stocks with a carefully balanced additive package. MILES HEAVY DUTY MOTOR OIL is designed to enhance engine performance and protect engine parts for extended life and reduced maintenance costs. MILES HEAVY DUTY MOTOR OIL is very resistant to the formation of high temperature deposits. The dispersant package works to keep the cooler areas of the engine from buildup of sludge and other harmful deposits. MILES HEAVY DUTY MOTOR OIL exceeds the requirements of the following API service categories: SAE 10W (CF/SL), 30 (CF, CF-2, SL), 40 (CF, CF-2, SL) and 50 (CF, CF-2, SL). MILES HEAVY DUTY MOTOR OIL meets the requirements of Allison C3/C4.