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got a 1990 cabby wi a s2 engine just recently rebuilt just bout run in wots the best oil to run it on its got piper 285 cam chip hybrid turbo also how often should i chance the oil.
I use Mobile 1 Rallye Formula 5w-50 fully synthetic ofcourse. I have been on the track six days on the same oil and since my crank is worn, the oil pressure never exceeds 30 PSI at "track warm" engine. The oil pressure has not gotten any lower and no new rattle or knocks. I can definitly recommend this oil.