It appears that Walmart doesn't do tune-ups. Their featured auto services include:
For more info, find your local Walmart Store with over 2,500 auto centers nationwide.
Visit the following sites that offer tune up services:
Every vehicle manufacturer has a list of scheduled maintenance for oil, tires and alignment. Your specific car, truck or van may have slightly different requirements, but there are general recommendations that apply to most vehicles. Read Walmart's Timeline Checklist for Oil, Tires & Alignment to prevent needless wear and tear on the car and keep it in great condition much longer.
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