K 1500 Yukon Denali AWD V8-6.0L VIN U (2002)
Positive Crankcase Ventilation Valve: All Technical Service Bulletins
Engine - Greater Than Normal Oil Consumption
File In Section: 06 - Engine/Propulsion System
Bulletin No.: 01-06-01-029B
Date: July, 2002
TECHNICAL
Subject:
Higher than Expected Engine Oil Consumption
(Replace PCV Valve)
Models:
2002 Chevrolet Avalanche
1999-2002 Chevrolet Silverado, Suburban, Tahoe Models
2002 Cadillac Escalade, Escalade EXT
1999-2002 GMC Denali, Sierra, Suburban, Yukon Models
with 4.8L, 5.3L or 6.0L Engine (VINS V, T, N, U - RPOs LR4, LM7, LQ9, L04)
This bulletin is being revised to clarify the parts information. Please discard Corporate Bulletin Number 01-06-01-029A (Section 06 - Engine/Propulsion
System).
Condition
Some customers may comment on higher than expected engine oil consumption. They may further comment on consumption in the range of 3,200 km
(2,000 mi) or less per quart (0.946 liter) of oil under normal driving conditions.
Cause
The condition may be due to the positive crankcase ventilation (PCV) valve flow rate under certain engine operating conditions.
Correction
1.
Verify that the oil consumption is not the result of an oil leak or other engine concern.
2.
The dealer should perform an oil consumption test. The vehicle should have accumulated over 6,450 km (4,000 mi) before establishing the oil
consumption rate. Reference Corporate Bulletin Number 01-06-01-011, Information on Engine Oil Consumption Guideline, for details.
3.
Remove the PCV valve and inspect the hose going to the intake manifold for signs of excessive oil being present.
