Final answer:
It is often true that a yellow tire crayon is a required tool for tire warranty as it is used to mark important information for warranty claims on the tire.
Step-by-step explanation:
The statement that a yellow tire crayon is a required tool for tire warranty is often true. During the installation or service of tires, technicians may use a yellow tire crayon to mark the tires with information that can be relevant for warranty purposes. This includes recording tread depth, irregular wear, or any defects that may be important when claiming a warranty. It's also used to mark the repair location for punctures or other damages. While it is not universally mandated by all tire manufacturers, many do require such markings for warranty claims to explain and verify the condition of the tire at the time of the service or when returning for a warranty claim.