2500 Pickup

Intake Manifold Gasket May Leak Coolant or Engine Oil on Chevrolet 2500 Pickup

Problem Description and Possible Solution

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. Our technicians tell us that operating the engine  with a coolant/oil mix can result in internal engine damage. Replacing the intake manifold gasket should correct these leaks.

Problem Data
RepairPal Verified
Average mileage: 142,583 (45,000–242,000)
Engines affected: 5.0L V8, 5.7L V8, 7.4L V8, Gasoline
11 model years affected: 1990, 1991, 1992, 1993, more1994, 1995, 1996, 1997, 1998, 1999, 2000
25 people reported this problem
Viewing 1 - 11 of 11 comments
My intake gasket was leaking also. I simply put Bars Leak in and it completely stopped. Amazing. I also want to add, that i have owned many trucks, newer ones, and I would not trade this good old truck for any of them. This is one tough solid truck
Mine leaked coolant to the out side

Replaced the intake gaskets and they have lasted 24,000 miles and three years. Now its leaking again
The intake gasket started leaking oil out the back of the block and then leaked air out of the plenum causing a misfire. Replaced the two gaskets and cleaned the intake, problem solved
Leaking coolent, not fixed yet. Also have problems with the Anti lock brakes. Sure wish Chevy would admit they have these issues.
I bought the truck used and it was leaking oil at the time. The leak slowly (over 10 years) became worse. To date, I have not fixed leak.
My intake gasket leaks coolant from the front of the intake. I resealed it and 10,000 miles later it developed again. Slower then before, a can of radiator stop leak fixed it though!