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3. Son of a Gun! Protectant manufacturer

Alternative clues for the word stp

• "Interstate Love Song" band, briefly (I had it on colored vinyl)
• Big Indy 500 advertiser
• Post-off. item
• Brand of engine additive
• Oil treatment inits.
• Pennzoil rival
• Big letters in racing
• Indy inits
• Standard temperature and pressure
• It's "inside every great machine"