She's a thirsty girl, 2.0 TFSI 8p2 S-Tronic. Was topping up 1 quart of oil after 800 miles and noticed some white gunk under the oil cap rim... Half of it was covered at least but it was not too thick... Is this a head gasket job? How much would that cost? I think it is pre-warning signs anyway. The car runs fine. Does not over heat. Idles fine etc. I have been driving about 50 motorway miles a day (5 days a week) and need it for work!! No visible leaks on any coolant hoses. Any advice as to what it may be, if its a common problem and the damage to the wallet? Many Thanks!