I have a 1998 Renault megane which is overheating - I cannot see any leak and keep having to top up radiator - it would appear though that the oil has some water contamination - white stuff visible inside oil filler cap. Car is also misfiring when engine cold - can anyone help please?

Paul Meades, January 2008

you head gasket has had it I had the same trouble last year

andy, January 2008