Ed White wrote:

> The 3000 mile oil chage fanactics are mostly repeating their
> grandfather's wisdom. 3000 mile oil changes have been the
> recommendation for years despite the fact that oil is much better how
> and engines are much much better better now.

You'll be hard pressed to find any vehicle manufacturer that has
recommended 3K mile oil changes. The first generation Saturns were one
exception, and this was because of the way the timing chain tensioner
worked, using oil as essentially a hydraulic fluid to ratchet up the
tensioner. The oil needed to be very clean or varnish would build up in
the timing chain tensioner bore, and would prevent the tensioner from
working properly.

5K is more than enough these days, with a huge margin of safety, and
7500 for non-severe driving is just fine.