That's not time.Oli:
Sure the metals corrode, the rubber cracks, the paint falls off.
Time didn't exist until sundials were built?Time is a figment of your imagination, what is effecting this car is sunlight, gravity, rain, forces which are measured and real. Time didn't exist until the cavemen decided to build a sundial, but thats not time either, merely the measurement of the movement of heavenly bodies.
There was a "before" and an "after" - that's time.
Any evidence?WRONG:If there were no time your car would remain in the same state "forever"
CORRECT: If there was no sunlight, gravity, universal forces, then and only then would my car just sit there "forever"
A million years go by... that's time, neh?Think about it, you die, there is no god, a million million years goes by in an "instant" because you're not aware of anything since you're dead, your atomic matter comes back together but its not you anymore, its just some other form of life which may or may not understand the CONCEPT of time.