Correct. The argument, I believe, is that if you're only making short
trips--say, a couple miles back and forth to work every day--you're
not getting the oil hot enough for long enough to boil off water and
other combustion byproducts that contaminate the oil (20 minutes at
highway speed is usually cited). If so, you should change at a
regular time interval--regardless of miles--to flush the contaminants.
Arguably, you could have a "flexible" schedule; i.e. change at four
months or 2,000 miles or similar depending on your driving habits but
"3 months or 3,000 miles, whichever comes first" is an easy rule of
thumb that works in most circumstances.
Bob
pethier@comcast.net wrote:
there's a
time recommendation as well, usually every 3 months regardless of
mileage,
I have yet to see a convincing argument of why this is needed. The contaminant
s from combustion seem to be the most important thing to me.
--
*******************************************************************
Bob Spidell San Jose, CA bspidell@comcast.net
*******************************************************************
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