Crankcase condensation prohibits annual oil changes even if you only
drive 500 miles a year.
If you only drive 3500 miles a year you still need to change it about
twice a year with either oil.

Stan Wilder

On Thu, 7 Mar 2002 07:35:07 -0800 Dana Morphew <kadm@PUGETSOUND.NET>
writes:
> Speaking of using or switching to synthetic oil, does anyone on the
> list know if
> the synthetics use TBN and antioxidation additives in adequate
> quantity to
> enable an extention of the engine oil change time interval to two
> years?  I
> drive 3500 miles/year in each vehicle, and only rarely are they
> driven less than

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