Very Interesting article.
For many years I drove junk oil burners and never changed the oil
because I regualrly had to add a Quart, I did do the filter though.
When I could afford a good car with conventional Oil I changed at the
7500 interval. I somewhat recently moved to using Penzoil Full Synthetic
and have bumped the change interval up to 10,000
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 þ SLMR 2.1a þ Typo Tom Strkes Again