I have always found this "change oil every 3K" thing to be excessive. I've
used synthetics for 15 or 20 years in varoius cars, but mainly in a 70 240Z
which was a BSP car and daily driver (well over 200K). The body finally
wore out (major cracks and a good bit of rust too). Just pulled the engine
and took it apart (gonna build it up for the AP car) and after probably 4 or
5 years since the last rebuild there was very little wear, and no sludge at
all. And I am lously at remembering oil changes. Would very from 5 or 6k
to 15 or 20k. More like "hmmm, oil seems to have been black the last few
times I checked the level, probably should change it".
Rick Brown
AP 240Z
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