2024–2025 GM Duramax L5P – Oil Cooler Defect – Class Action Investigation

Ahdoot Wolfson is investigating a potential class action lawsuit against General Motors following reports of an oil cooler defect in 2024–2025 model year GM heavy-duty trucks equipped with the 6.6L Duramax L5P engine.

A recurring defect pattern appears in 2024–2025 GM HD trucks with the 6.6L Duramax L5P, where oil-cooler cracks and dump engine oil into the coolant, causing rapid oil loss and catastrophic engine failure at relatively low mileage. There is no targeted recall or TSB, forum reports show multiple incidents and warranty denials, and repair costs are high, making this a strong candidate for a consumer class action on design/manufacturing defect, breach of warranty, and consumer protection theories.

If you own(ed) or lease(d) a 2024–2025 GM truck equipped with a Duramax L5P engine and experienced oil system issues or engine failure, please fill out the form below and one of our attorneys promptly will contact you.