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
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.
Hyundai and Kia SP-branded ATFs are separate automatic-transmission-fluid requirements, not a simple upgrade ladder. Learn the practical difference between older SP-III, common SP-IV, rear-drive SP-IV-RR and newer SP4-M/SP4M-1 applications, plus how to verify the correct 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