Walmart will use any technicality to avoid performing warranty work. I recommend NOT paying for anything extra if you do use Walmart auto services.
Example: Yesterday, August 6, my disabled neighbor paid one of my farm employees to take her car to Walmart for warranteed tire rotation and repair of a flat tire. The service manager refused to honor the warranty even after being shown the appropriate documents, claiming that the individual who purchased the tires must be physically present for warranty work. They spoke to her on the telephone and still refused to honor their warranty, claiming the tire had to be replaced at her cost (over $100) and that they would not do tire rotation unless she paid an additional $9 per tire.
After four hours of waiting the work was finally done. Since my neighbor is ill and disabled, I ended up paying for all of this, including my employee's wages and time. My neighbor attempts to live on a miniscule Social Security check and cannot afford unexpected expenses of this nature, which is why she purchased the road hazard warranty.
It is a well-established legal principle that one has the right to assign an agent to take care of this sort of thing. We won't talk about common decency, because it is clear that the service manager was getting his orders from somewhere higher on the chain where decency is not held in high regard. He was apologetic, but stated that he "would lose his job" if he honored the warranty.
I recommend avoiding Walmart auto service centers, and ALL extended warranty offers. Once they have your money their main concern is avoiding performing the services supposedly guaranteed by the warranty. In other words, you become the enemy, and how far do you really think you will get trying to fight Walmart?