Truck buyers cannot claim a payment yet in the Silverado oil cooler lawsuit. The case seeks class-wide damages and a repair or replacement program for owners of affected heavy-duty trucks. A proposed class action is a lawsuit filed on behalf of a larger group, but a judge must approve that group before anyone recovers.
According to Pickup Truck Talk's report on the filing, Robert Hubof filed Hubof v. General Motors LLC, No. 2:26-cv-13622, in the U.S. District Court for the Eastern District of Michigan on September 24, 2026.
Official resource:
- Read the official notice from Guessingheadlights — Use this primary source to verify the official announcement.
Table of Contents
- Which trucks are included?
- What failure does the lawsuit allege?
- What happened in the lead plaintiff's case?
- What compensation is being sought?
- What should owners do now?
Which trucks are included?
The proposed class covers 2024–2026 Chevrolet Silverado 2500HD and 3500HD trucks with the 6.6L L5P Duramax diesel engine. It also covers the matching GMC Sierra 2500HD and 3500HD diesels from those years.
According to GM Authority's coverage of the models named, the case focuses only on trucks equipped with that Duramax engine. Gas-engine HD trucks are outside the described group. The suit seeks a nationwide class plus a separate Idaho subclass.
What failure does the lawsuit allege?
The complaint alleges the engine oil cooler can crack during normal driving. Pressurized oil can then enter the cooling system, leak outside the engine, or cause engine failure.
An oil cooler is a part that keeps engine oil at a safe temperature. When it cracks, oil and coolant mix where they should stay separate. That contamination can damage hoses, seals, and internal engine parts quickly.
What happened in the lead plaintiff's case?
Hubof says his new 2024 Silverado 2500HD, bought in December 2023, made a loud bang in June 2025 at about 16,453 miles. He found oil in the coolant bottle and an oil leak under the truck.
A GM technician found the cooling system full of engine oil plus metal debris in the oil. According to Guessing Headlights' update on the repair estimate, Hubof received a $41,319.79 repair quote that was not covered under warranty. The suit alleges GM denied warranty coverage by blaming low oil, even though a failed cooler itself lowers the dipstick reading.
What compensation is being sought?
The lawsuit seeks class certification, monetary damages, and a court-ordered repair or replacement program. It does not offer an open claim form or individual payouts now.
That means owners do not apply for money at this stage. If the court certifies the class and the plaintiffs win or settle, eligible owners could receive repairs, reimbursement, or damages under terms set then. No amount per owner has been established.
What should owners do now?
Watch for oil in the coolant reservoir, sudden oil loss, overheating, or oil spots under the engine. Save repair orders, warranty decisions, photos, mileage records, and receipts for towing, rentals, and oil or coolant work. The case remains only a proposed class action, with no certified class and unproven liability claims.
- Confirm your year, model, and 6.6L L5P Duramax diesel engine
- Photograph oil in the coolant bottle and any underbody leak
- Keep the dealer diagnosis, estimate, and warranty denial in writing
- Track mileage, dates, and out-of-pocket costs in one file