i think oil is coming from my exhaust. what would cause this? i thought it was fuel at first. the car had a random chip in it and some 42 # injectors. i got a thrasher chip burnt to match the injectors... it left a spot on my driveway from both exhaust pipes that was dark like oil. could it be the turbo or something in the engine? the car runs pretty good but it has a noise to it i dont like... im trying to track down what it could be. i am about to go investigate. what do u think i should look for?