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Sometimes it's more age than mileage mate. The metal rings around the cylinders and bolt holes, oil /water galleries etc in the head gasket corrode away and aluminium head with steel bolts just need a bit of coolant around them to make a nice battery which causes all sorts. Triumphs used to have major problems with the recardo engine until saab bought it and put stainless bolts in. Just a bit of useless information for you lol. P.S. sometimes coolant leaks into engine show up on exhaust gas emissions test.