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Oils are rated SH, SJ, SK maybe they skipped K, SL, SM, SN.
SH was back in the 1980s, SJ was 1990s through 2000ish, SL by mid 2000s and so on.
SH oil has the most antiwear additives and detergents.
The current standard SN has the least. By a factor or a lot.
SH oils can have 3 times the antiwear additives and up to around 4x the detergents than an SN oil.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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