Manufacturer communication — 2006 GMC YUKON XL

• The model list includes the 2000–2019 GMC Sierra, 2500/3500, and Yukon XL.

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  2000–2019 GMC Sierra, 2500/3500, Yukon XL

• It applies to vehicles with a gasoline engine rated at 8600 GVW and above.

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  with Gasoline Engine and Rated at 8600 GVW and above

• The accepted rate of oil consumption for gasoline engines in vehicles at or above 8600 GVW is 0.946 liter (1 qt) within 379 liters (100 gallons) of fuel used.

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  The accepted rate of oil consumption for gasoline engines in vehicles at or above 8600 GVW is 0.946 liter (1 qt) within 379 liters (100 gallons) of fuel used.

Possible causes

• Towing a trailer or hauling additional weight will increase oil consumption.

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  Towing a trailer or hauling additional weight will increase oil consumption.

Steps to confirm (in the document’s order)

1. Inspect the oil pans, engine covers and the engine oil cooler for leakage, and inspect for oil leakage into the engine coolant.

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   Inspect the oil pans, engine covers, and the engine oil cooler for leakage. Inspect for oil leakage into the engine coolant.

2. Let the vehicle sit for at least 15 minutes after the engine has been shut off before taking an oil level reading.

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   The vehicle should be allowed to sit for at least 15 minutes, after the engine has been shut off, before taking an oil level reading

3. Verify that the positive crankcase ventilation (PCV) system is operating properly; blockages, restrictions or damage to the PCV system can result in increased oil use.

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   Verify that the positive crankcase ventilation (PCV) system is operating properly. Blockages, restrictions or damage to the PCV system can result in increased oil use.

4. Begin the oil consumption test after the next regularly scheduled oil and filter change; oil changes should not be performed during the test.

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   Begin oil consumption test after next regularly scheduled oil and filter change. Oil changes should not be performed during the test.

Repair

• If the final evaluation shows that the engine uses more than 0.946 liter (1 qt) in 379 liters (100 gallons) of fuel used, follow the published symptom diagnostics in the appropriate Service Manual.

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  If the final evaluation shows that the engine uses more than 0.946 liter (1 qt) in 379 liters (100 gallons) of fuel used, follow the published symptom diagnostics as described in the appropriate Service Manual.

Caution

• This rate only applies to vehicles under warranty, maintained in accordance with the appropriate maintenance schedule, driven at legal speeds and within the design intent of the vehicle.

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  This rate only applies to vehicles under warranty, maintained in accordance with the appropriate maintenance schedule, driven at legal speeds and within design intent of the vehicle.

• Oil economy should not be tested until the vehicle has accumulated at least 8000 km (5000 mi) and the oil has been changed for the first time.

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  oil economy should not be tested until the vehicle has accumulated at least 8000 km (5000 mi) and the oil has been changed for the first time.

• If the test shows that the engine uses less than 0.946 liter (1 qt) in 379 liters (100 gallons) of fuel used, explain to the customer that the engine meets the guidelines for oil consumption.

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  If the oil consumption test shows that the engine uses less than 0.946 liter (1 qt) in 379 liters (100 gallons) of fuel used, explain to the customer that their engine meets the guidelines for oil consumption.