The worst would be wrecking it, of course. But having dealt with a particularly trying malady over the past fourteen months, I would like to suggest that a wet interior ranks pretty high on the ‘stuff you never want to happen to your car’ list.
The autumn after buying my SEAT Leon, I noticed the passenger footwell was very wet. The problem was traced to perished seals, both on the pollen filter housing, and the doors. I made quick work of repairing the seals, but drying out the car is something I’ve been working at now off and on for nearly fourteen months, and has required disassembling significant portions of the interior.