Check your PCV system, and make sure the throttle body is clean, especially downstream from the throttle plate. There's two or three little holes drilled into the throttle body just downstream from the plate to allow metered vacuum to varioius sensors.
One of these holes is the PCV suction hole: Make sure the airway all the way from the PCV to the throttle body is unobstructed.
PCV valves aren't that much $$. Try replacing it.
Make sure there isn't a lot of sludge or carbon deposits on within the valve-train area. Remember that the PCV valve is on one side of the engine "V" and the blow-by tube is on the other side. If there is an obstruction of air flow within the crank-case, the PCV can pull air all it wants, but there will still be a positive pressure on the other side (blow-by), and this positive pressure will blow thru the tube towards the air cleaner, bringing oil vapor with it.
Also try the different oil strategy I recommended.
Finally, this is a wild guess, but a logical thought:
Make sure the main airway upstream from the air filter is not obstructed. There should be a large snorkel leading to the body panels and/or frame. Around the battery someplace. Make sure there's nothing stopping airflow thru the main air path.
If there is any obstruction, the negative pressure within the air cleaner chamber will pull in air from any available source. The next available source besides the main snorkel is the blow-by pipe, which brings all that oil vapor, which eventually soaks into the filter as you describe.
If everything fails and you can be creative with pvc plumbing pipe and fittings/adapters, create a pipe pathway with a small chamber filled with steel wool which leads to the air cleaner. This way, any oil vapor travelling up the tube will be caught by the steel wool, liquify, and drain back into valve cover thru the same tube the vapor was sucked up. The remaining air (without the oil vapor) will travel to the air cleaner chamber to be consumed during regular engine operation.
Believe me, I've tried this with success. Just make sure you use long strands of steel wool entangled with one another so no short stray strands fall into the valve cover, and get entangled in the valvetrain.
Tuesday, March 17th, 2009 AT 8:51 PM