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01-06-01-011H Information on Engine Oil Consumption Guidelines - (Oct 29 2013) Engine Lubrication

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Subject:Information on Engine Oil Consumption Guidelines

#01-06-01-011H: Information on Engine Oil Consumption Guidelines - (Oct 29, 2013) Engine Lubrication

Models: 2014 and Prior GM Cars and Gasoline-Powered Light Duty Trucks Under 8500-LB GVW
  

This bulletin has been revised to add the 2013-2014 model years. Please discard CorporateBulletin Number 01-06-01-011G.

All engines require oil to lubricate and protect the load bearing and internal movingparts from wear including cylinder walls, pistons and piston rings. When a pistonmoves down its cylinder, a thin film of oil is left on the cylinder wall. During thepower stroke, part of this oil layer is consumed in the combustion process. As a result,varying rates of oil consumption are accepted as normal in all engines.

Oil Consumption

The accepted rate of oil consumption for engines used in the vehicles referenced is0.946-liter (1-qt) in 3200-km (2000-mi).

Important:This rate only applies to personal use vehicles, under warranty, that are driven ina non-aggressive manner and maintained in accordance with the appropriate maintenanceschedule, with less than 58,000-km (36,000-mi), or driven at legal speeds in an unloaded(for trucks) condition.

Important:This rate does not apply to vehicles that are driven in an aggressive manner, at high RPM, high speeds, orin a loaded condition (for trucks). Oil consumption for vehicles driven under theseconditions will be more.

Many factors can affect a customer's concern with oil consumption. Driving habitsand vehicle maintenance vary from owner to owner. Thoroughly evaluate each case beforedeciding whether the vehicle in question has abnormal engine oil consumption.

Gasket and External Leaks

Inspect the oil pan and engine covers for leakage due to over-tightened, damaged,or out of place gaskets. Inspect oil lines and fittings for signs of leakage.

Improper Reading of the Oil Level Indicator (Dipstick)

Verify that the dipstick tube is fully seated in the block. When checking the oillevel, make sure the dipstick is wiped clean before taking an oil level reading andfully depress the dipstick until the shoulder bottoms out on the dipstick tube. Thedipstick should be the proper part number for the engine/vehicle that is being checked.

Notice:Operating your vehicle with an oil level that is below the minimum level indicatedon the engine oil dipstick can result in severe engine damage. Repairs resulting fromoperating an engine with insufficient oil are not covered under the terms of the NewVehicle Warranty.

Important:Refer to Owner Manual in SI for checking and adding engine oil.

Not Waiting Long Enough After Running Engine to Check Oil Level

Some engines require more time than others for the oil to drain back into the crankcase.To assure a sufficient amount of oil has drained back to the crankcase, and an accuratereading can be obtained, 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. In order toensure accurate results, the temperature of the oil should be close to the same temperatureas the last time the oil level was checked.

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