The intake manifold gasket may develop and external engine oil or coolant leak. In some cases, an internal coolant leak may occur causing coolant to mix with the engine oil. Running the engine with a coolant/oil mix may result in engine damage. Replacing the intake manifold gasket should correct this issue.
Car Problem Reports
Chevrolet 3500 Pickup Intake Manifold Gaskets May Leak Coolant or Engine Oil
Chevrolet 3500 Pickup Problem
Engines Affected: 5.7L V8, 7.4L V8, Gasoline
Average Mileage: 137,220 mi (66,000 mi - 250,000 mi)
Visitor, 2000 Chevrolet 3500 Pickup, 7.4L V8, 126,324 mi
Yeap, went out to check my oil level and saw that it was way overfilled and discovered I had a bad lower intake manifold gasket leak. Spent most all the weekend replacing the lower intake manifold gaskets and that fixed the problem for me. That was completed back in November 2012 and today as I am writing this passage is 25 February 2013. So all is good and my oil level after the gasket change is staying the same level.
Visitor, 2000 Chevrolet 3500 Pickup, 5.7L V8, 80,000 mi
leaks antifreeze out of overflow resavour and u can smell it after refilling antifreeze. actually leaking out of intake manifold gasket at back of motor. have just been refilling coolant about 1 a month . now have 93000 on it and antifreeze is high priced so i need to replace gasket .
Visitor, 1999 Chevrolet 3500 Pickup, 5.7L V8
Purchased a brand new crate engine replacement for my 1999 chevy 3500 silverado. Been chasing an engine miss for over a year now. could not believe that the gaskets were leaking until coolant was noted as being low during a fluids check after an oil change.
I took it to the dealer as the engine is still under warranty. they will only replace the gasket. i guess I have to live with the engine when she blows as the ccoolant has probably been leaking into the engine since the miss started.
I wish I could buy a Toyota 1 ton truck in this country. I have had enough of this chevy crap. Why they got a bail out is beyond me! no pride in their products or what!
Visitor, 2000 Chevrolet 3500 Pickup, 5.7L V8, 66,000 mi
water in the oil
Fleet mechanic and have two trucks with this aparent problem, mostly seems this or head gasket cuz the oil get milky choco latte' . Radiators also leak which may have caused the gasket failure... still under investigation.
Visitor, 1998 Chevrolet 3500 Pickup, 7.4L V8, 192,000 mi
Intake manifold gasket has failed twice, $750 to repair.