Anyone know where i can find the oil cooler on my 97 A4? If so, are there any tell tale signs that it is knackered? I thought my head gasket had gone after discovering some murky looking fluid leaking from the engine bay. After a little investigation and finding the coolant chamber empty (except for a brown gunk) i settled on the decision that the head gasket had gone. The oil in the engine was also pretty much non existant where it was trying to cool it by itself. Not being able to afford anyones prices for this kinda job i thought i'd give it a go. Only prob is that the sump is not full of that gunk (oil and coolant mixed), so i'm left wondering whether it is the head gasket after all???? Anyone out there got any ideas on any of this?