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alright i looked it up for ya
and here it is:
SL is For all automotive engines presently in use. Introduced July 1, 2001. SL oils are designed to provide better high-temperature deposit control and lower oil consumption. Some of these oils may also meet the latest ILSAC specification and/or qualify as Energy Conserving.
SJ is For 2001 and older automotive engines.
and this is straight from the American Petroleum Institute or API service
it also notes that
"For automotive gasoline engines, the latest engine oil service category includes the performance properties of each earlier category. If an automotive owner’s manual calls for an API SH or SJ oil, an API SL oil will provide full protection. For diesel engines, the latest category usually – but not always – includes the performance properties of an earlier category. ( API)"
so to put it in a brief sentence, it is best for all cars to now use API Service SL, the older oil types are not as advanced
hope this helps ya bro
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