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2008 6.6L Duramax – OIL CONSUMPTION DIAGNOSIS

The accepted rate o f oil consumption, not due to leaks, is the use o f 0.946 liter (1 qt) or less within 379 liters (100 gallons) o f fuel used. This rate only applies to vehicles under warranty, maintained in accordance with the appropriate maintenance schedule, driven at legal speeds and within design intent o f 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. During initial engine break-in periods before the first oil change, oil consumption may exceed 1.9 liters (2 qts) or more per 379 liters (100 gallons) o f fuel used.