Manufacturer communication — 2006 GMC YUKON DENALI XL

• Applies to all GM passenger cars and trucks, 2000 through 2022, gasoline engines only.

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  All GM Passenger Cars and Trucks 2000 2022 — — Gasoline Engines Only

Possible causes

• Debris from a damaged rod or main bearing is sent directly through the oil galleries and the components in the lubrication circuit.

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  If an engine experiences an engine failure due to a damaged rod or main bearing the debris from the bearing is sent directly through the oil galleries and components that are in the lubrication circuit.

Repair

• Whenever an engine assembly is replaced for a connecting rod or crankshaft main bearing failure, also replace the oil cooler, oil cooler lines and oil tank, if equipped.

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  The purpose of this bulletin is to inform service personnel that any time an engine assembly is replaced due to a connecting rod or crankshaft main bearing failure, it is necessary to also replace the oil cooler, oil cooler lines and oil tank if equipped.

Caution

• Reinstalling an oil cooler or cooler line from an engine with bearing failure debris may carry remaining debris into the new service engine.

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  Reinstallation of an oil cooler and/or cooler line that was removed from an engine with a bearing failure debris may result in the transfer of any remaining debris into the new Genuine GM Part service engine.

• Some service engines come with the oil cooler and/or oil cooler lines already attached; those need not be replaced.

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  Note: Some service engines come with the oil cooler and/or oil cooler line(s) already attached to the new service engine. In this case, replacement of those components is not necessary.

• Not every engine with bearing damage requires the oil cooler, lines or oil tank, or even the engine, to be replaced.

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  Note: Not every engine that has bearing damage requires an oil cooler, oil cooler line, oil tank replacement or even the engine to be replaced.