01-06-01-011H Information on Engine Oil Consumption Guidelines - (Oct 29 2013) Engine Lubrication - part 2
Important:This does not apply to 2006-2009 Corvette Z06 equipped with the 7.0L LS7 and the 2009Corvette ZR-1 with the 6.2L LS9 engines (dry sump). Follow the instructions in theOwner Manual for checking the oil in this application.
Improper Oil Fill After an Oil Change
Following an oil change, verify that the proper amount and type of oil was put inthe engine and that the oil level on the dipstick is not above the full mark or belowthe add marks. Refer to the Owner Manual or Service Manual for information on recommendedoil quantity, viscosity, and quality.
Aggressive Driving, High Speed or High RPM Driving
Aggressive driving and/or continuous driving at high speeds/high RPMs will increaseoil consumption. Because this may not always be an everyday occurrence, it is hardto determine exactly how much the oil economy will be affected.
A higher rate of oil consumption is normal for vehicles equipped with manual transmissionsthat are driven aggressively. By “aggressive,” we mean operation at high RPM (3,000RPM to redline), with frequent use of engine braking (using the engine to slow thevehicle). Vehicles that are driven aggressively may consume engine oil at a rate ofup to 0.946-L (1-quart) every 805-km (500-mi). This is normal for avehicle that is driven aggressively. No repair is necessary. This characteristic does,however, require the owner to check the engine oil level at sufficiently frequentintervals, especially when driving aggressively, to assure the oil level remains withinthe recommended operating range. As the Owner’s Manual recommends, you should checkthe oil level every time you get fuel.
Towing or Heavy Usage
Towing a trailer will increase oil consumption and may cause oil consumption to fallbelow the normal accepted rate referenced in this bulletin for an unloaded vehiclein a personal use application. Large frontal area trailers will further increase thework required from the engine, especially at highway speeds, and thus increases therate of oil consumption.
Crankcase Ventilation System
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.
Oil Dilution (Fuel and Water)
On vehicles that are usually driven short distances, less than 8-km (5-mi), especiallyin colder weather, unburned fuel and condensation generated from cold engine operationmay not get hot enough to evaporate out of the oil. When this occurs, the dipstickmay indicate that the oil level is over-full. Subsequent driving on a trip of sufficientlength to enable normal engine operating temperature for 30-minutes ormore, in order to vaporize excess moisture and fuel, may give the customer the impressionof excessive oil consumption.
If an engine is run at overheated temperatures (see Owner's Manual or Service Manual)for more than brief periods, oil will oxidize at a faster than normal rate. In addition,gaskets may distort, piston rings may stick, and excessive wear may result.