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Posted by D Sherman [72.47.153.24] on Sunday, May 13, 2012 at 02:46:18 :
In Reply to: Simple question --maybe... posted by Bob in North GA [71.30.9.108] on Saturday, May 12, 2012 at 22:35:38 :
On big engines where an oil change is expensive, they actually send an oil sample to a lab and have it analyzed. That tells them whether it really needs changing or not. I know the labs test for suspended metal particles, but they also test for various other things that I don't know the details of
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