I've noticed my oil level decreases whenever the airfilter gets dirty, well 3 weeks of use, average everyday city driving, then I'd have to buy a new air filter and same thing happens again and again, until I noticed my turbo was wet with oil, i decided to dry up the turbo and use the car without an air filter, and after using the car, the turbo is still dry, what could be the problem with my turbo? Do I need to buy a new turbo? or second hand at least?