Alright well i just bought an audi because i wanted to get out the honda seen too many thieves in the jdm world. So i purchased a 1997 a4 1.8t and for some reason the car sounds like a diesel truck ( like a f-150 or something of that sort). It happens when the car is on parked and when im driving. Some tell me it might be an oil leak but i have no idea. If any one could give me an idea of what it could possibly be that would be appreciated thanks!