"Khee Mao" <yousuckbigbad_buddhadaddy@yahoo.com> wrote in message
news:c6p6jp$sjg$1@nntp1.u.washington.edu...
> I've recently moved downtown and am now walking to work (and just about
> everything else), which has decreased my monthly mileage to somewhere
> between 100 and 200 miles total. I know the oil companies say 3 months/
> 3000 miles (despite my manual saying at least twice that), but changing
oil
> every 600 miles seems kind of ridiculous. does oil go bad from age as
well
> as wear?
>
>

The 3mo/3k miles guideline is still being debated, but, on a car that
doesn't make very long trips (enough to completely warm the engine and
evaporate water vapor), I would stick with the 3 month. Condensation in the
oil leads to sulfates (think that's the right word - it's late...) that
attack bearing surfaces. Don't want that, now do we? :-)

HTH

Jeremy