Independent technical reference
Understand the API, ACEA and manufacturer standards behind modern engine oils—without the jargon.
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Start with the standard
Browse independent organizations or specifications written by vehicle manufacturers.
International and regional classifications for engine performance and oil quality.
OEM requirements designed around specific engines, service schedules and emissions systems.
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The learning path
Start with the owner’s manual and find the required viscosity and specification.
Learn what each organization or manufacturer approval actually requires.
Confirm the oil carries every required claim—viscosity alone is not enough.
Technical library
Renault RN numbers are engine-oil requirements, not interchangeable labels for 0W-20, 5W-30 or 5W-40. This guide explains the practical differences among RN0700, RN0710, RN0720, RN17 and RN17 FE, including the important limits on backward compatibility.
Porsche oil codes identify manufacturer approvals, not just oil thickness. This guide explains the practical meaning of A40, C20, C30, C40 and C40 GT, why two 0W-40 oils may still be unsuitable substitutes, and how to verify the correct approved product for a Porsche engine.
Ford’s WSS-M2C engine-oil codes are vehicle material specifications, not interchangeable shorthand for viscosity. This guide explains how to read common 5W-20, 0W-20 and 5W-30 Ford WSS requirements, why API or ILSAC marks still matter, and how to choose oil without assuming that a newer-looking code fits every Ford or Lincoln engine.
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Oil Specifications for iOS
Keep essential organization and manufacturer oil specifications close at hand on iPhone and iPad.
View on the App StoreBuilt for quick reference