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3. Oil additive brand

Alternative clues for the word stp

• Brand sold at gas stations
• Inits. at Indy
• Ultra 5-In-1 Fuel System Cleaner brand
• Engine additive since 1954
• Product at a gas station
• Longtime sponsor in NASCAR events
• Indy additive
• Auto additive brand
• 1985 Union Carbide acquisition
• Longtime Indy sponsor