Reason For L87 Recall

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GM’s L87 engine recall was caused by manufacturing defects in the 6.2L V8 L87 engine affecting the connecting rods and crankshaft. Specifically, sediment contamination on the connecting rods and in the crankshaft oil galleries, as well as issues with the crankshaft’s specifications and finish, have led to rod-bearing damage. This damage can cause the engine to fail, resulting in a loss of propulsion and posing a safety hazard. Some affected vehicles have experienced symptoms like unusual engine noises, check engine lights, and performance issues before complete engine failure occurs.
The recall covers about 597,630 vehicles in the U.S. from model years 2021 to 2024, including Cadillac Escalade, Chevy Silverado 1500, GMC Sierra 1500, and others. GM estimates around 3% of these engines will require replacement due to these defects. The issue has led to a class-action lawsuit alleging that GM was aware of the defect for years and failed to disclose it, with some owners experiencing engine failures even after replacing their engines.
As a temporary fix for engines not needing replacement, GM recommends switching to higher viscosity oil along with replacing the oil fill cap, oil filter, and updating the owner’s manual. However, this remedy has faced criticism and legal challenges over concerns that it reduces fuel economy without fully solving the problem.
In summary, the recall stems from defective connecting rods and crankshaft components causing potential catastrophic engine failure.