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
GM dexosD is a licensed diesel engine-oil requirement, not a substitute name for 0W-20 or 5W-30. Learn how it replaced dexos2 for light-duty diesel use, why the exact viscosity still matters, and how to verify a genuinely licensed oil.
JASO FB, FC and FD describe performance levels for gasoline two-stroke oil, with FC focused on reduced smoke and FD adding stronger high-temperature cleanliness. Learn why the grade matters, why it does not set the fuel-mix ratio, and why TC-W3 marine oil is a separate requirement.
JASO GLV-1 and GLV-2 are fuel-economy-focused gasoline engine-oil classifications, but they cover different viscosity ranges and are not substitutes for a vehicle maker’s exact requirement. Learn how GLV-1, GLV-2A and GLV-2B relate to 0W-8, 0W-12, 0W-16 and 0W-20 oils.
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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