I have a 2014 Focus ST3 that I bought cheap last year with 145k miles. It now has 157k miles and has been using a lot of oil ever since I bought the car. It has the ford racing tune, filter, step colder spark plugs and exhaust and that's it. It's been tuned ever since roughly 25k miles and is still on the original clutch. When I get into full boost you can see black smoke out the exhaust. If I drive it slow, and don't get into boost, it loses about a quart every 1,000 miles if I get into boost it loses a lot more than that. I did a compression test soon after I bought the car and it was 1-149, 2-140, 3-145 and cylinder 4 was 145. Anyone has any ideas what could be going on? Does not have a catch can and there's always oil residue on the hood insulation and on top of the intake tube like it's blowing out somewhere. No check engine lights or engine knocks. Thanks in Advance!