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1999-2002 Chevrolet Silverado - Oil Consumption - PCV

Higher than Expected Engine Oil Consumption

1999-2002 Chevrolet Silverado - Oil Consumption - PCV

Postby Dean508 [OP] » Jan 07 2013, 8:18pm

Bulletin No.: 01-06-01-029B

Date: July, 2002

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.

4. If excessive oil is present in the PCV hose, replace the PCV valve (Type 948C) (2) with a new-style fixed orifice PCV valve, GM P/N 12572717 (1).

Important: The new style fixed orifice PCV valve contains no moving parts, and does not rattle when shaken.
If the vehicle has an orifice style PCV valve, investigate other causes for high oil consumption.
Original Poster
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Dean508
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Posts: 144
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Location: Massachusetts
Year: 2000
Make/Model: Chevrolet Silverado
Extra Info: 2500 6.0L 4x4
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Re: 1999-2002 Chevrolet Silverado - Oil Consumption - PCV

Postby Dean508 [OP] » Jan 16 2013, 2:39pm

Installed this updated PCV on my 2000 6.0L (60k miles). Topped off the oil, Vavoline 5w30 Full Synthetic.
I will continue to monitor oil consumption and report if this updated PCV has had any effect on my oil consumption.

One week check, oil level normal where I left it (topped off).
I will continue to update this thread with my findings.
Original Poster
User avatar
Dean508
Combustion on 1 piston [L2]
Combustion on 1 piston [L2]
Posts: 144
Topics: 13
Images: 26
Joined: Aug 17 2012, 7:15pm
Years of membership: 2 years of membership2 years of membership
Location: Massachusetts
Year: 2000
Make/Model: Chevrolet Silverado
Extra Info: 2500 6.0L 4x4
Group Membership:
Automotive Technicians
Registered users

Re: 1999-2002 Chevrolet Silverado - Oil Consumption - PCV

Postby Dean508 [OP] » Feb 01 2013, 10:25pm

I confirmed the $10 spent on the new PCV was a great investment.
I am not chewing through oil anymore in the 6.0!
Just checked my level today and it is still good.

I will do a top end cleaning (clean the line) and monitor the amount of oil collecting there with the new valve. *
* When outside temperatures are more favorable! :)
Original Poster
User avatar
Dean508
Combustion on 1 piston [L2]
Combustion on 1 piston [L2]
Posts: 144
Topics: 13
Images: 26
Joined: Aug 17 2012, 7:15pm
Years of membership: 2 years of membership2 years of membership
Location: Massachusetts
Year: 2000
Make/Model: Chevrolet Silverado
Extra Info: 2500 6.0L 4x4
Group Membership:
Automotive Technicians
Registered users

Re: 1999-2002 Chevrolet Silverado - Oil Consumption - PCV

Postby Joe Cool » Feb 02 2013, 12:52am

Mine's definitely leaking, but I think I'll do this just to satisfy my OCD.
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Location: Leesburg, NJ
Year: 2000
Make/Model: GMC Sierra
Extra Info: 2500 SLE 6.0 4x4
Group Membership:
Registered users

Re: 1999-2002 Chevrolet Silverado - Oil Consumption - PCV

Postby Dean508 [OP] » Apr 02 2013, 12:48am

These engine prefer conventional oil in regards to oil consumption.
I get much less loss with conventional oil VS synthetic....
Original Poster
User avatar
Dean508
Combustion on 1 piston [L2]
Combustion on 1 piston [L2]
Posts: 144
Topics: 13
Images: 26
Joined: Aug 17 2012, 7:15pm
Years of membership: 2 years of membership2 years of membership
Location: Massachusetts
Year: 2000
Make/Model: Chevrolet Silverado
Extra Info: 2500 6.0L 4x4
Group Membership:
Automotive Technicians
Registered users

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