Possible Clues:

• Additive that once sponsored Richard Petty
• Big car racer sponsor
• Engine performance aid
• Motor Up alternative
• Brand at a gas station
• It once had a jingle with the line "One little can will keep you running free"
• Brand of motor oil additive
• Big name in auto additives
• Granatelli canful
• Product with the old jingle line 'One little can will keep you running free'