What's the probable cause of engine using oil (no external leaks). approx. one quart every 500 miles

1999 SUBARU FORESTER
145,000 MILES
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JSCARVILLE
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Vehicle purchased new and properly maintained; started using oil approx. three years ago; other techs indicate this year engine has known problems with so called "blow by".
Dec 10, 2011 at 1:16 AM
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