Hi, Just wanted some quick advice from anyone who has had a head gasket fail on the 2.0 TDI 170 engine. My brother has a Golf GT 170 and was about to get it mapped when the mechanic noticed oil on the undertray. (He wanted to map to remove the DPF as this is also failing) The mechanic has since traced this to a leak from the head gasket - quote for fix is £700. The car is a 56 plate with 17,000 miles on it. Just after some advice really - Is this common? If the repair is done to a good std is there any reason it woudl fail again? If you had a Head Gasket done would it put you off mapping the car? Thanks anyone!