Sinclair Oil (Sinclair), an HF Sinclair (NYSE:DINO) brand, announced today its third annual DINO Days, a five-day customer promotion running June 1–5, 2026, in honor of National Dinosaur Day.

DINO Days has grown from a one-day promotion in 2024 to a five-day event featuring fuel savings, games and chances to win DINO merchandise.

The promotion begins Monday, June 1, on Facebook and Instagram (@sinclairoilcorp), where followers will help build the ultimate summer road trip playlist. On Tuesday, June 2, to celebrate Sinclair's 110^th anniversary, DINO fans will have 110 chances to win a DINO merchandise box filled with fan-favorites. Winners to be announced June 5.

On Wednesday, June 3, the fun continues with a secret password hidden on Sinclair's social media channels. Once found, the first 110 customers can claim a fuel discount via direct message.

On Thursday, June 4, Sinclair customers can save up to 30 cents per gallon on all fuel grades at participating locations. To access the discount, customers must clip the DINO Days coupon in DINOPAY^®, Sinclair's easy-to-use mobile payment app, available for free on the Apple App Store and Google Play. Additional information about the DINO Days gasoline promotion and DINOPAY^® is available at SinclairOil.com/DINODays.

DINO Days concludes on June 5 with Folds of Honor Friday. Customers who donate $50 or more in support of Folds of Honor will earn a 50-cent DINOPAY fuel coupon redeemable in July. Folds of Honor provides educational scholarships to the spouses and children of America's fallen or disabled military service members and first responders.

"This celebration, which coincides with National Dinosaur Day, keeps growing because it's been such a hit with our customers and our distributors," said Fergie Theriault, vice president of branded marketing for HF Sinclair. "DINO Days has expanded from one day to three days and now five days in 2026 as we continue to add more fun, more giveaways and more savings. With this year's fuel discount applying to all grades of fuel, we're excited to welcome even more customers to be a part of DINO Days."

Spotted on station signage from coast to coast, the Sinclair dinosaur first became associated with the company through advertising campaigns in the 1930s. Since then, the green dinosaur has become a symbol of Sinclair Oil and its parent company, HF Sinclair, appearing on gas pumps, station signage, merchandise and more.

For more information, visit SinclairOil.com.

About HF Sinclair Corporation:

HF Sinclair Corporation, headquartered in Dallas, Texas, is an independent energy company that produces and markets high-value light products such as gasoline, diesel fuel, jet fuel, renewable diesel and other specialty products. HF Sinclair owns and operates refineries in Kansas, Oklahoma, New Mexico, Wyoming, Washington and Utah. HF Sinclair provides petroleum product and crude oil transportation, terminalling, storage and throughput services to its refineries and the petroleum industry. HF Sinclair markets its refined products principally in the Southwest U.S., the Rocky Mountains extending into the Pacific Northwest and in other neighboring Plains states. It supplies high-quality fuels to more than 1,700 branded stations and licenses the use of the Sinclair brand at more than 350 additional locations throughout the country. HF Sinclair produces renewable diesel at two of its facilities in Wyoming and also at its facility in Artesia, New Mexico. In addition, subsidiaries of HF Sinclair produce and market base oils and other specialized lubricants in the U.S., Canada and the Netherlands, and export products to more than 80 countries.

About Sinclair Oil:

Sinclair Oil, an HF Sinclair brand, is one of the oldest continuous brands in the energy business. Recognized for its iconic dinosaur, Sinclair has more than 1,800 independent Sinclair-branded and licensed stations throughout the country. DINOPAY® is an app-based payment system that allows users to pay for fuel and in-store items with their mobile device, track receipts, utilize fuel discounts and locate the nearest Sinclair location.

Terms and conditions for DINO Days promotions are available at SinclairOil.com/DINODays

View source version on businesswire.com: https://www.businesswire.com/news/home/20260529837685/en/

Media Inquiries

media@hfsinclair.com

Sinclair's Largest Promotion of the Year Is Back and Too Big for Just One Day