Historical clue formulations

• Longtime NASCAR sponsor — 2026-07-14
• Valvoline rival — 2026-06-17
• Motor oil brand — 2026-04-13
• Sponsor of auto racing's Sprint Cup Series — 2026-04-03
• Pennzoil competitor — 2026-01-20
• Product with the additive zinc dithiophosphate — 2026-01-17
• Longtime NASCAR sponsor — 2026-01-11
• Longtime NASCAR sponsor — 2025-12-10
• Speedway sponsor — 2025-10-29
• Product known as "The Racer's Edge" — 2025-04-14
• Speedway additive brand — 2025-03-13
• Brand of motor oil — 2025-02-03
• Pit stop brand — 2024-10-29
• Valvoline competitor — 2024-10-28
• Indy label — 2024-10-25
• Longtime NASCAR sponsor — 2024-09-29
• Pennzoil competitor — 2024-09-22
• Noted speedway sponsor — 2024-08-15
• Brand seen at AutoZone — 2024-06-29
• Big name in motor oil — 2024-06-02
• "The Racer's Edge" sloganeer — 2024-01-07
• Garage brand — 2023-07-02
• Longtime sponsor of 8-Down — 2023-02-07
• Filling station brand — 2023-02-05
• Noted speedway sponsor — 2023-01-29
• Longtime NASCAR sponsor — 2022-11-20
• Brand seen at speedways — 2022-02-13
• Motor oil brand — 2022-02-07
• Indy 500 sponsor — 2022-01-17
• Canful at a gas station — 2021-10-26
• Valvoline rival — 2021-10-20
• 500 letters? — 2021-10-15
• Garage brand — 2021-06-25
• Longtime advertiser at the Indy 500 — 2021-04-19
• Fuel additive brand — 2020-12-13
• Automotive brand with an oval logo — 2020-12-01
• Brand sold at gas stations — 2020-07-01
• Popular gas additive — 2020-04-27
• Rival of Havoline — 2019-11-10
• Big brand with an oval logo — 2019-06-06
• Motor oil product — 2019-02-04
• Brand at a garage — 2018-09-20
• Nascar additive — 2018-09-04
• Engine additive since 1954 — 2018-07-09
• Pennzoil competitor — 2018-04-15
• Big engine additive — 2018-02-04
• Big advertiser at auto races — 2018-01-15
• Fuel additive brand — 2017-11-06
• Indy racer sponsor — 2017-08-10
• Motor oil brand — 2017-02-09