The current highest standard for gasoline engines (introduced in 2020). It’s designed to protect against "low-speed pre-ignition" (LSPI) in modern turbocharged engines. CK-4 / FA-4: Current standards for diesel engines.
Refined crude oil. Good for basic, older engines with frequent change intervals. engine oil specs.7z
The most common spec is the SAE (Society of Automotive Engineers) grade, like . engine oil specs.7z