I have fumes inside my Audi 90. It's a 2.8 V-6 SOHC. I have checked the exhaust and there aren't any leaks that I could see. Thought there might be cause it's loud, but I guess it's all attributed to when I removed one of the catalayic converts when in broke. The smell and affect of the fumes seems to be worst when decellerating from fast speed or when downshifting. Is it possible that the oil leak I have is getting burned of on a hot part of the car like the exhaust for example and getting intside the cabin? I can't imagine why it would get worst when decellerating. Exhaust catalayic converts are covered with oil. Maybe it gets in through the air intake, where is it any one know? Any one ever have this problem?