> where large clearances or other issues come into play). If and when Detroit
> adopts 15k mile oil changes from everything from a Ford Focus to a Corvette,
> that will be the day you can trust that interval figure. Until that day,
> 5-6k miles seems to be the current industry norm.
So far as I can tell 10-15K *is* the norm these days, the GM engines
with oil-change counters (including the LS6) run that distance, and
pretty much all the Euro makes are 12K-ish. Indeed, going 20K km
between oil changes seems to be a market imperative in Europe.
As with coolants, manufacturer oil requirements are splintering. 5W-30
is not 5W-30, for instance - the viscosity range allowed is too broad,
and BMW's idea of a 5W-30 is not Mobil's or GM's or...
John.
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