GM 8.1 496 gas engine "normal" oil loss/use?
Just returned from our first looong trip with this truck and camper package and noticed (what I think) excessive oil use. The does not leak but in 3800 miles needed 1 1/2 qts., that seems like a lot t...
Forum Discussion
1qt per 1000 is normal but here's a bulletin to look at:
High Oil Consumption (Replace Intake Manifold Bolts) #02-06-01-035 - (10/17/2002)
High Oil Consumption (Replace Intake Manifold Bolts)
2002 Chevrolet Avalanche
2001-2002 Chevrolet Silverado, Express, Suburban
2001-2002 GMC Sierra, Savana, Yukon XL
2001-2002 Chevrolet and GMC C6-7 Conventional Cab Medium Duty and B7 School Bus Models
with 8.1L Engine (VINs G, E -- RPO L18)
Condition
Some customers may comment about higher than expected oil consumption. Because this type of engine is used under various load conditions, the dealer should verify that the vehicle is using more than 0.946L (1 quart) of oil for every 379L (100 gallons) of fuel used.
Cause
Oil vapor pulled into combustion chamber through the intake manifold may cause this condition.
Correction
Replace all the intake manifold bolts. Replace one bolt at a time in sequence to keep the intake manifold from shifting.
Notice
Ensure the intake manifold does not shift as the intake manifold bolts are tightened in the proper sequence. Failure to follow the entire intake manifold bolt tightening sequence exactly may result in an oil leak and serious engine damage.
In the order shown below, remove each bolt and replace with a new bolt. Insert the new bolt and tighten to 5 N·m (44 lb in). Then move to the next bolt in sequence until all bolts have been replaced.
After all of the bolts have been replaced, tighten each bolt in sequence to 8 N·m (71 lb in).
Tighten all bolts in sequence to a final torque of 12 N·m (106 lb in).
Parts Information
Part Number
Description
Qty
12561518
Bolt, Intake Manifold
10
Parts are currently available from GMSPO.
Warranty Information
For vehicles repaired under warranty, use:
Labor Operation
Description
Models
Labor Time
J0290
Bolts, Intake Manifold - Tighten or Replace
C/K, C6-7, B7
0.7 hr
G Van
1.5 hrs
High Oil Consumption (Replace Intake Manifold Bolts) #02-06-01-035 - (10/17/2002)
High Oil Consumption (Replace Intake Manifold Bolts)
2002 Chevrolet Avalanche
2001-2002 Chevrolet Silverado, Express, Suburban
2001-2002 GMC Sierra, Savana, Yukon XL
2001-2002 Chevrolet and GMC C6-7 Conventional Cab Medium Duty and B7 School Bus Models
with 8.1L Engine (VINs G, E -- RPO L18)
Condition
Some customers may comment about higher than expected oil consumption. Because this type of engine is used under various load conditions, the dealer should verify that the vehicle is using more than 0.946L (1 quart) of oil for every 379L (100 gallons) of fuel used.
Cause
Oil vapor pulled into combustion chamber through the intake manifold may cause this condition.
Correction
Replace all the intake manifold bolts. Replace one bolt at a time in sequence to keep the intake manifold from shifting.
Notice
Ensure the intake manifold does not shift as the intake manifold bolts are tightened in the proper sequence. Failure to follow the entire intake manifold bolt tightening sequence exactly may result in an oil leak and serious engine damage.
In the order shown below, remove each bolt and replace with a new bolt. Insert the new bolt and tighten to 5 N·m (44 lb in). Then move to the next bolt in sequence until all bolts have been replaced.
After all of the bolts have been replaced, tighten each bolt in sequence to 8 N·m (71 lb in).
Tighten all bolts in sequence to a final torque of 12 N·m (106 lb in).
Parts Information
Part Number
Description
Qty
12561518
Bolt, Intake Manifold
10
Parts are currently available from GMSPO.
Warranty Information
For vehicles repaired under warranty, use:
Labor Operation
Description
Models
Labor Time
J0290
Bolts, Intake Manifold - Tighten or Replace
C/K, C6-7, B7
0.7 hr
G Van
1.5 hrs
