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3. Fuel additive known as "the racer's edge"

Alternative clues for the word stp

• Crankcase additive
• Pit stop can
• Gas additive brand that sponsors a NASCAR race at a Virginia track
• It's "inside every great machine"
• Motor Up alternative
• Brand sold at gas stations
• Lndy 500 advertiser
• Gas tank additive
• Motor oil additive
• "Interstate Love Song" band, briefly