What is the answer to "Speedway additive brand" in the NYT Crossword?

The answer to the NYT Crossword clue "Speedway additive brand" is STP (3 letters).

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NYT

Speedway additive brand NYT Crossword Clue

Down clue · from the March 13, 2025 puzzle

Stuck on “Speedway additive brand” from the New York Times Crossword? Here is the verified answer:

Answer

STP

3 letters · Down · last seen March 13, 2025