well ive been burning a small amount of oil or a while now only on deccel and when my car sits at idle for a while would that be safe to say that my turbo's oil seal went out?? and also i put my finger in the coupler the connect to the turbo and my fingertip was covered in black oily sludge that would be the turbo right?? and i did a compression test everything came out to around 160psi per cylinder thanks.