I recently noticed my car (A3 1.8T S-reg 1999, 125'000 miles) is letting water into the engine as when i take the oil cap off a lot of steam comes out the cap hole. The oil is still clear and no oil has mixed with the water (well it is not visible in the expansion tank anyway). Can anyone tell me what might be the problem with the car? i suspeceted a head gasket failure but it is not showing all the signs, just some. Any help on this would be greatly appreciated. I hessitate to take it to the garage in case they try to fix a gasket and the problem still persists.