On 3.9L V6 and 5.9L V8 engines, the intake manifold gasket may leak and cause increased oil consumption and a spark knock during acceleration; the gasket should be replaced.
Car Problem Reports
Dodge Ram Van 1500 Increased Oil Consumption Due to Intake Manifold Plenum Gasket Leak
Dodge Ram Van 1500 Problem
Engines Affected: 3.9L V6, V8
Average Mileage: 215,000 mi (130,000 mi - 300,000 mi)