Car Problem Reports

GMC Suburban 2500 Intake Manifold Gaskets May Leak Coolant or Engine Oil

GMC Suburban 2500 Problem
11 Reports
Me Too

Model Years Affected: 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999

Engine Affected: 7.4L V8

Average Mileage: 100,666 mi (50,000 mi - 132,000 mi)


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.

  • Visitor, , 7.4L V8, 50,000 mi

    Has been leaking for past 45,000 miles only enough to smell antifreeze after engine is hot. Does not leak enough to drip on driveway. Requires pint of coolant every second oil change (8,000 - 10,000k miles).

    Flag This
  • Visitor, , 7.4L V8, 132,000 mi

    Intake manifold gasket failed and was leaking outside on the rear of the block passenger side. I was told that original gaskets deteriated due to use of Dex-Cool antifreeze. gasket was replaced and new antifreeze added, no problem so far

    Flag This
Ask a Question