Recently I've read on here of head gasket failures particularly with the D4D engined SR180. Wifes car is an '08 SR 180. About 57k miles (I think) and regularly serviced by Toyota main agent. Is there a particular cause for this gasket failure. I presume overheating caused by some failure in the cooling system and I guess the most likely culprit would be the water pump. Touching wood very firmly, her car has not suffered any such problem. Is there anything I can do to ensure it does not befall su