Has anyone tried any of these? A mate asked me to check his daughter's Vauxhall Meriva 1.6 tonight. Starting problems apparently. He said when he checked her car there was no water in it! I got it running - seemed ok at first but loads of steam coming out of the exhaust and then running rough at idle. Almost certainly head gasket. No oil contamination. It is a bad blow judging by the amount of steam coming out of the exhaust. I suspect the head gasket sealers are in with a chance on a weeping gasket but would have no chance in a case like this. I would love to be proved wrong though.