Just got the car back after having the cylinder head gasket replaced under warranty (on its last day in warranty !). The garage said they had never had to replace one of these before (due to it being faulty) and my car has done less than 30k so its a bit of a surprise. I have always had to top it up with oil (once every 6 months) but I just assumed that it was due to the type of driving I do (lots of short journeys) and I don't recal anyone else having one of these go.
Bob
Bob