Quote Originally Posted by Jolly Roger VX'er View Post
My own personal experience has taught me that there was a double-edged sword involved with oil consumption in my engine.

The EGR Valve..if not properly recirculating exhaust gases back into the cylinders to be reburned (EGR=Exhaust Gas Recirculation) under normal operation, would lead to higher cylinder temps. Just like if you were to block it off and deny proper operation.

When the EGR is functioning properly, it is "smothering" the cylinders with spent exhaust gas that is meant to be reburned for environmental sake and therefore not letting in a totally fresh air/fuel mixture during the intake stroke. In effect...it is lowering the efficiency of each cylinder. Make the EGR inoperable either through failure (ie.stuck closed) or physically blocking it off and the cylinder temps go up due to the more efficient combustion of a fresh air/fuel intake charge not being smothered by exhaust gasses fed into the cylinders through the intake by the EGR.

Then...add in a malfunctioning PCV which leads to high crankcase pressure that "resists" the oil in the cylinder attempting to return back to the oil pan.

Now that you have oil lingering around in the cylinders due to opposing pressure of a stuck PCV and higher cylinder temps due to a stuck EGR you get alot of oil burn-off during the combustion process.

In short...My VX started using oil before I supercharged it at 30,000 miles; and after I cleaned out the EGR with oxgen sensor safe carb cleaner to remove the black carbon that was causing it to stick closed....and after I started changing the PCV at regular intervals to maintain proper operation....the oil usage dropped drastically to what I consider normal (approx. 1/4 quart in 3,000 mile oil change interval....sometimes less)

I recommend cleaning the EGR @ 30,000 mile intervals...or replacing it if cleaning it doesn't free up a stuck valve. I recommend maintaining proper operation of the PCV.

If there is an oil ring problem..it will only be exaggerated by the failures of either the EGR and/or the PCV systems....think of all this as a triangle...where you have control over 2 of the 3 legs.
I got to agree with you about this one,my mech told the same thing as you explained here.

The PCV should be replace every oil change just for the sake of the engine.

In february i'll have my VX's transmission,transfer case & differential fluids serviced & i'll probally have the EGR cleaned so make sure full performance is delivered