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Motor Oil; SAE 15W-40; 1 Gallon; O'Reilly Multigrade Motor Oil protects today's smaller six-cylinder and four cylinder engines, as well as older, larger engines from severe driving conditions such as city driving. Meets API SM, SL Service Classification and …

The '15w' part of the grade means that the oil flows like a 15-weight oil in cold conditions, which helps with cold starts. The '40' means it acts like a 40-weight oil at the engine’s operating temperature, maintaining thickness to protect against wear.

Ultra1Plus SAE 15W-40 Full Synthetic Heavy-Duty Diesel Engine Oil - 15W 40 Motor Oil API CK-4/SN (5 Gallon Pail)

NAPA Fleet 15W-40 Diesel Motor Oil contains a higher concentration of additives compared to regular motor oils, enabling it to effectively remove and suspend harmful contaminants that accumulate in diesel engines.

It exceeds all automobile and light truck warranty requirements for gasoline and turbocharged engines where an API SM and ILSAC GF-4 oil is recommended. Protects against wear, rust and corrosion, piston scuffing and combustion chamber deposits, high-temperature oxidation and valve train wear.

TRIAX Fleet Supreme 15W-40 API CK-4, Full Synthetic Diesel Engine Oil, Friction Optimized and Boosted with Molybdenum & Nano-Boron, Superb Powerstroke Performance (5 Gallon Pail) 4.7 out of 5 stars 341

Provides all the protection you expect from an SAE 15W-40 but in a synthetic blend heavy duty engine oil; Goes beyond CK-4 wear limits, delivering an average of 37 percent better than the maximum wear requirements; Demonstrates 55 percent better deposit control than CK-4 15W-40 oil as demonstrated in multiple deposit control tests

2022年9月29日 · 15W-40 is a common grade of engine oil that is often suggested for diesel engines. The thickness of oil changes based on how hot or cold it is. Oil tends to get thicker when it’s cold, and when it’s hot, it thins out.

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