Join Date: Sep 2010
Location: Orland Park, IL
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The best idea would be to pressure test the system. Once you do that you can immediately heqar or see where the leak if coming from (if it's external). If you see absolutely NOTHING and you checked every inch of the car, check the oil as 06gtoin216 said, and if it looks like a milkshake then you definite;y have an internal leak. This is mostly due to head gasket leaks, so check everything out and make sure the car's okay.
18 years old and LOVING my GTO!!!
05 IBM GTO A4
Lingenfelter CAI, NGK plugs, wires, OBX LT's w/cat-delete mid pipes, Spintech cat-back 2.5" X-pipe and 4" tips, custom paint, Overhauled 4L65E race trans with transgo shift kit, 2500 stall.