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
Honda ATF DW-1 and HCF-2 are different transmission-fluid requirements for different hardware. This guide explains why conventional automatic transmissions and belt-type CVTs need distinct friction behavior, why older Honda fluids add further complexity, and how to verify the correct replacement fluid.
Toyota ATF WS and Toyota CVT Fluid FE serve different transmission designs. This guide explains why a hybrid e-transaxle may use ATF WS, why a belt-type CVT normally requires CVT Fluid FE, and why neither name is a viscosity grade or universal replacement rule.
MERCON ULV, MERCON LV and MERCON SP are separate Ford automatic-transmission-fluid specifications, not a simple progression of interchangeable low-viscosity oils. Learn how to read the associated Ford material codes, why transmission design controls the choice, and how to verify a replacement fluid.
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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