GM Changes Recommended Oil Again for Recalled 6.2-Liter V-8 Engines Amid Lawsuit

February 10, 2026 – DETROIT — General Motors has once again changed the recommended engine oil for vehicles equipped with its troubled L87 6.2-liter V-8, as the automaker continues to face scrutiny, a federal investigation, and a lawsuit over potential engine failures.

According to a report by GM Authority, GM has issued updated guidance to dealers recommending Mobil 1 FS 0W-40 oil for the L87 engine, replacing Mobil 1 Supercar 0W-40, which had been specified since a massive recall last year. A GM spokesperson confirmed the change to Car and Driver, citing price and availability as the primary reasons.

The L87 small-block V-8 is used in a range of GM half-ton trucks and full-size SUVs, including popular Chevrolet and GMC models. The engine has been under investigation by the National Highway Traffic Safety Administration (NHTSA) over reports of potential catastrophic failures.

In April 2025, GM announced a recall affecting nearly 600,000 vehicles after an initial NHTSA probe was expanded. At that time, the company said a key part of the fix was switching from the factory-specified 0W-20 oil to the heavier Mobil 1 Supercar 0W-40, a move intended to provide additional protection under high loads and temperatures.

The latest change marks the second time GM has revised its oil recommendation for the L87 since the recall. While the new oil retains the same 0W-40 viscosity, the brand shift has raised questions among owners already concerned about engine reliability.

GM has not indicated that the oil change reflects a new mechanical fix, and the federal investigation remains ongoing. Meanwhile, a lawsuit alleges GM sold vehicles with a known defect, claims the company has not admitted.