Crossword clues for Auto additive 3 letters:STPAuto additive productSTPAndy's auto additiveSTPAuto additive lettersSTPAuto additive brandGASAuto additiveSTPBig name in auto additivesSTPAuto additives co. that hints at this puzzle's themeSTPAuto additive with a mostly red oval logoSTPAuto additive with a red oval logoSTPAuto additiveSTPAuto-additive initialsSTPAdditive sold at Napa Auto PartsTHELASTPICTURESHOWJeff Bridges film sponsored by an auto additiveEXHAUSTPERFUMESAdditives to improve the smell of auto emissions?