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
Mercedes-Benz 235.0, 235.7 and 235.74 are axle and hypoid gear-oil approval sheets, not interchangeable names for any GL-5 lubricant. Learn why 235.0 is now historical, how 235.7 fuel-economy oil differs, what the 235.74 front-axle listing means, and how to identify the correct approved fluid.
Allison TES 668, TES 295 and TES 389 are performance and approval categories for many commercial on-highway automatic transmissions. Learn why TES 668 is Allison’s current preferred fluid family, how TES 295 remains relevant, why TES 389 has different service implications, and how to verify an exact approved product.
JASO DH-2, DL-1 and DL-2 are diesel engine-oil classifications developed around Japanese engine designs and exhaust aftertreatment systems. Learn why DH-2 is for heavy-duty use while DL-1 and DL-2 serve passenger-car classes, why ash limits matter, and why none is a universal substitute.
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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