why is it going through so much oil?
Well it is an 18 year old car. The real measure of oil consumption is how many miles per quart.
Use thicker oil if consumption or replace gaskets if leaking.
Check for leaks, clogged PCV valve. Could also be worn rings and or valve seals in the engine if high mileage.
I had the same problem and it turned out to be a leaking valve cover gasket these cars were given from the factory cheap valve cover gaskets. Plus my oil pan drain plug was leaking at the same time too!
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