[slartyblarfast]

If it's under warranty take it to the dealership.. There is a TSB to retorque the head bolts. They will have to do that first. Then they will have to replace the head gasket. I do these fairly often and the retorqueing does no good. The head gasket will have to be replaced. You may get lucky and the PT may have powertrain warranty. Check with the dealership before you go into the engine. If it's warranty and you go messing with it then you void warranty.