Diesel Engine Oil Standards: API CK-4 vs FA-4 Explained
In heavy-duty diesel engines, picking the right engine oil is very important. The right oil helps engines run better, last longer, and follow the manufacturerโs rules. The new API CK-4 and API FA-4 oils can be confusing for technicians and fleet managers. This simple guide will explain the main differences, which engines each oil works […]
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