My car has 160,000 miles on turbos, arround 3500-4500 I loose power for an instant when that happens there is no sound frome blow off valve. this only happens sometimes. Also recentally after approx.20-30 min car wants to die when gas pedal is pushed. have oil leak only when running some smoke also. My check engine light has been on since I bought it. cats are bad turbos bad whare is oil coming frome cant locate it help please!

 

oil can be coming from the turbos, from my experience, the seal on the turbo goes and oil can leak from there.