Sinclair Launches Mammoth Monday, With Fuel Savings of up to 25 Cents Per Gallon
Sinclair Oil (Sinclair), an HF Sinclair (NYSE: DINO) brand, announced today the national launch of Mammoth Monday™, a new weekly fuel savings event designed to reward loyal customers with one of Sinclair’s biggest fuel discounts of the week. Beginning Monday, Aug. 3, 2026, eligible DINOPAY® users c…