I consume about a quart of oil every 400 miles and about have a quart of cooland if that. Did a compression test got around 170 across the board. Runs great but just the consumption issue. Had a bad oxegen sensor but fixed that. What can I do to find out what it is?

 

do a leak down test to pinpoint your problem...just because the compression numbers are consistent dosent mean you don't have a problem, or you can redo the compression test, but add a little oil to the cylinders to see if that number changes