If you have got fancy metal tyre valve dust caps, check that you can still unscrew them. I put some on mine, couldn't get them off, had to cut the valves off and fit new ones with plastic caps ! 4 tyres had to come off, new valve & rebalance Cost me 40 quid !Was thinking of changing the badge to a transformers badge. As already got transformers dust caps.
I know that now !!Hi roger
This is quite common with alloy dust caps, the valve needs to be smeared with grease/copperslip to help prevent it. Talking from experience, cos like you I had the very same happen some years ago.