Need info on 2500 Suburban w/8.1 eng.

[subfan1]

You may have a intake manifold gasket failure. My 98 7.4l engine did the same thing. It leaked on the drivers side. I had it repaired about 4 years ago, they used a felpro gasket.
Take a look at your engine between the intake manifold and the valve covers.

[rangebowdrie]

Chevy used a special ring set on those engines, the oil control ring is a 4mm., low tension ring to decrease friction losses. The using of a little oil is normal.

[davidz71]

TSB 01-035- (Oct. 17, 2002) applies to 2002 Avalanche, '01-'02 Silverado, Express, Suburban, '01-'02 GMC Sierra, Savana, Yukon XL and '01-'02 Chevy/GMC C6-7 Conventional Cab Medium Duty and B7 School Bus Models with the 8.1 litre engine (VIN G, E--RPO L18)

"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 qt.) of oil for every 379L (100 gallons) of fuel used." As stated earlier in a post, oil vapor was being pulled into the combustion chamber through the intake manifold. The correction is to replace all the intake manifold bolts one at a time in sequence to keep the manifold from shifting. Each manifold bolt should be tightened to 44 lb. inches then again in the sequence specified to 71 lb. inches then to 106 lb. inches. The intake manifold bolt part number is 12561518 and you will need 10 of them.