Quote:
Originally Posted by otto_kretschmer
look for a 20w50 with a SG or SH rating
mobil 1 Vtwin, Castrol 4t, Redline 20w50 motorcycle oil
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SG hasn't been available since 1993 SH 1996
Current M1 V-twin is SJ and while it is the correct 20w/50 weight has more ZDDP than i desired except for a break in oil, it's P spec is 1750ppm and Zn is 1850
minimmum ZDDP specs for our cars want to be ~1000ppm
M1 Racing 4T 10w/40 is 1200/1300 a very good place to be
M1 turbo Diesel 5w-40 is 1100/1300
M1 truck & SUV 5w-30 is not only too light it's spec is 800/900
Plain ole M1 15w-50 whicch is what I have used for a few decades is 1200/1300
Driven Brad Penn(now called Penngrade 1) also have excellent oils that I've occasionally used