Related Clues:

• Logo on some NASCAR autos
• Indy letters
• Big name in auto products
• Car care product
• Clorox brand
• Initials on a Nascar car
• Engine additive letters
• Motor oil additive
• 500 letters
• Certain 'edge'
• Dura Lube alternative
• Fuel additive
• Motor oil additive brand
• Letters at a Nascar race
• Pit stop stuff