Well car surfaces (or even interior) can get hotter than that for example. Also, 1 test doesn't cover a use case of 5-10 years of daily heating and cooling down

Well car surfaces (or even interior) can get hotter than that for example. Also, 1 test doesn't cover a use case of 5-10 years of daily heating and cooling down ie on a car parked outside, or darker window frame on a sunny side of building.