[Dancake]

Cbv8, I'm sure you weighed up your options before asking for advice. An engine mount that no longer holds vacuum will in most cases still function perfectly well as an engine mount, doing its job of securing the engine to the subframe. Unless it's physically damaged and causing excessive movement, it should be perfectly serviceable for 400 miles and the rest. In an ideal world it should be replaced, but with any component on a vehicle the condition at the time of inspection determines the urgency at which it should be replaced.