Related Clues:

• Racer's sponsor, perhaps
• Gas additive
• 'The Racer's Edge' sloganeer
• Big name at Indy
• Freelancer's encl.
• Indy 500 advertiser
• 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