If the exhaust is clearly very steamy, it means coolant is getting into the cylinders. That's typically via a leaky IMG. You might get more signs by looking at No1 and 4 spark plugs. IMG leakage usually affects these by producing a 'washed' appearance and the ceramic insulator may be stained pink (if you use OAT antifreeze). Also remove the oil filler cap when the engine's running. See if there's any obvious steam coming out of there.
TC
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