King Soopers class action lawsuit overview:
- Who: Plaintiff Lindsey DeHart filed a class action lawsuit against Dillon Companies LLC and HF Sinclair Corp.
- Why: DeHart claims the companies sold contaminated fuel that damaged consumers’ vehicles.
- Where: The class action lawsuit was filed in Colorado federal court.
A new class action lawsuit accuses King Soopers and Sinclair of selling contaminated fuel that damaged consumers’ vehicles.
Plaintiff Lindsey DeHart filed the King Sooper class action complaint against Dillon Companies LLC (doing business as King Soopers Fuel Center, King Soopers Inc., King Soopers and City Market) and HF Sinclair Corp. on Jan. 27 in Colorado federal court, alleging violations of Colorado consumer protection law.
The King Soopers class action lawsuit alleges the companies sold motor fuel represented as unleaded gasoline that was actually contaminated with diesel fuel, causing widespread economic damages to consumers across Colorado.
The lawsuit claims that unleaded regular and plus grade gasoline was contaminated with diesel fuel at a terminal operated by Sinclair in Henderson, Colorado, and then delivered to retailers — including King Soopers — along the Front Range in Colorado.
Lawsuit: contaminated fuel caused widespread and immediate economic damages
The King Soopers class action alleges at least 400,000 gallons of contaminated fuel may have been affected. King Soopers sold the contaminated fuel to consumers from Jan. 7, 2026, through Jan. 8, 2026, at 13 locations, the lawsuit claims.
The lawsuit alleges that the contaminated fuel caused immediate drivability issues, injector fouling, fuel system damage and catastrophic engine failure in gas-powered vehicles.
Consumers reported that their vehicles began to sputter, hesitate, misfire or lose acceleration shortly after fueling, and many required towing to repair shops, the lawsuit says.
The King Soopers class action alleges that the defendants acted negligently and recklessly by failing to implement reasonable quality control, inspection, testing, oversight, supervision and monitoring procedures to prevent the contamination.
As a result, DeHart claims consumers suffered economic losses, including engine damage, engine failure, repairs and diminution of vehicle value.
DeHart seeks to represent a class of individuals who purchased unleaded regular or plus grade gasoline contaminated with diesel fuel from the Sinclair terminal, as well as a subclass of those who purchased the contaminated fuel at King Soopers gas stations.
The lawsuit seeks compensatory and statutory damages, economic losses, consequential damages, injunctive relief, attorneys’ fees and costs.
Currently, BP Products North America is still facing a class action lawsuit claiming that Amoco stations in New York are charging 70 cents per gallon more than advertised for consumers using a credit card.
What do you think of the claims made in this King Soopers class action lawsuit? Let us know in the comments.
The plaintiff is represented by Alexandra K. Piazza, Shanon J. Carson, Justin D. Cole and Soledad Slowing-Romero of Berger Montague P.C.
The Sinclair, King Soopers class action lawsuit is DeHart v. Dillon Companies LLC, et al., Case No. 1:26-cv-00330, in the U.S. District Court for the District of Colorado.
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