See also:

Tire tread
WARNING Although the applicable federal motor vehicle safety laws consider a tire to be worn when the tread wear indicators (TWI) become visible at approximately 1/16 in (1.6 mm), we recomm ...

Checking the oil level using the oil dipstick
Example: vehicles with a gasoline engine Example: vehicles with a diesel engine – Park the vehicle on a level surface. To check the oil level with the engine at operating temperature, swi ...

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