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dont do 0:40 if u can avoid it 5:40 minimum generally recommended on here up2 15:60 at trackday fun as a general guide i use 10:40 fully synth
Si (happy medium)
I run a 1990 Toyota 7M-GTE on Mobil-1 and its running perfectly, its expensive as synthetic oils go, but you get what you pay for...as you do with most things these days