I don't think you will find any oil that has a rating less than "SJ". SJ supercedes all others before it, such as "SH, SG, etc. Likewise, there will be a "SK" rating coming out later this year, which of course will supercede the current "SJ" rating.
1994 MB E320 Coupe (199,500 mi)
1992 MB 190E 2.6 (173,000 mi)
1983 Porsche 911SC (148,000 mi)
2004 Volvo V70 2.5T (198,000 mi)
President of CT/Westchester Section