See also:

Sidewall
The part of the tire between the tread and the bead. ...

PSI (pounds per square inch)
A standard unit of measure for tire pressure. ...

High outside temperatures
If DEF heats up to over 122 °F (50 °C ) for extended periods, e.g. as a result of direct sunlight on the DEF reservoir, DEF can decompose. Ammonia vapors develop as a result. WARNING When o ...