Related Clues:
- Biofuel option
- Gas alternative
- Valvoline rival
- Fuel that yields a net energy loss
- Engine additive
- Brand of octane booster
- Additive sold at Pep Boys
- Slick 50 competitor
- Oil additive
- Type of biofuel
- Long time NASCAR sponsor
- Reunited Scott Weiland band, briefly
- Biofuel choice
- Fuel additive brand
- Auto engine conditioner