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Technical guides on engine oils, viscosity grades and API classifications
8/18/2026howto
How to choose the best engine oil for a diesel engine
Higher compression and a much heavier soot load make diesel oil a different problem from petrol. Here is what the viscosity grade and the API service category actually tell you, and how to match them to the way the engine is worked.
8/10/2026howto
How to read an engine oil label: SAE, API and ACEA explained
Three codes on every bottle tell you more than the brand name does. Here is what SAE viscosity grades, API service categories and ACEA sequences actually mean — and which one your engine's manual gets to decide.