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How many groups of base oils are there and how do they differ? The American Petroleum Institute (API) classifies base oils into 5 separate categories. Those 5 categories are Group I, Group II, Group III, Group IV, and Group V. Groups I, II, and III are refined from petroleum crude oil. Group IV base oils […]
What is Cetane? Most diesel engine owners are familiar with the term Cetane, but what does it mean and why is it important? Cetane is like octane in gasoline fuel in that it measures the fuel combustion efficiency. A higher cetane number means the fuel combusts more quickly; a lower cetane number means the fuel […]
Diesel oil functions One of the most important functions of a diesel engine oil is to neutralize the acids created by the combustion of diesel fuel. When diesel fuel is burned in an engine, several highly acidic by-products are produced. These very strong acids, if not neutralized, attack the metals of crucial moving parts. Diesel […]