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Magnum Engine Oil Consumption and Ping
From Volume 27 of the Star Center News and other sources

Excessive Oil Consumption and/or Ping- V6, V8 Ram

When diagnosing any oil consumption or ping concerns for the 3.9/5.2/5.9L Magnum engines, we've found that one of the most common causes involves the plate on the bottom of the intake manifold. If the plate looses it's seal, oil can be sucked into the engine from the lifter valley area, causing a higher than acceptable oil consumption rate.  The acceptable oil consumption standard is one quart of oil per 1000 miles.

Testing the Intake Plenum and gasket for leaks:

1.   Allow the engine to reach operating temperature, then shut it down.

2.   Disconnect the breather hose from the air cleaner and attach a vacuum/pressure gauge to the end of the hose.

3.    Remove the PCV hose from the manifold vacuum port and PCV valve and cap both the port and valve.

4.   Restart the engine and allow it to run for several minutes to stabilize the crankcase pressure.

5.    Watch the vacuum/pressure gauge - Slight pressure is OK, vacuum indicates that the intake plenum is leaking and allowing the engine to draw a vacuum in the crankcase.

Chrysler has revised the gaskets - see TSB 09-05-00 for part numbers and replacement procedures. After gasket replacement, Chrysler recommends using combustion chamber cleaner (Part No. 04318001) to decarbonize the cylinders. Allow the cleaner to soak in for a couple of hours before starting the engine, and a second application may be required on particularly heavy deposits