Mine's saturated with Mobil! With the recent oil change, I bet some of the fresh stuff got sucked through the PCV line which branches off the filler neck. It's really not bad.. the filter's just a honey color and the engine runs beautifully. My '88 Cougar never displayed this oddity, but then the 3.8 is also set up unlike the 351W. With 91K miles, I doubt the piston rings would even be a possibility. The oil stays in the filter element and consumption appears normal.

So what're the rest of your crankcase filters looking like? (Gawd.. I must be the only geek to ever have asked that.. lol) Any ideas as to the source of the condition?

 

Yes, I also have that problem. Mine is real bad, I have to get a new one like every oil change. The filter gets hard and falls out, and then there is oil in the intake box and the air filter gets oil o it.
I read in a post a while back there is a fix, I haven’t got around to doing it yet but I should.
I found it! Here is the post from a while back explaining how to fix it.

"The pcv valve has a hose that attaches to the back of the intake plenum just above the #8 cylinder runner. Just follow the hose from the pcv valve to the manifold and pull the hose off the nipple and remove the pcv valve and hose. You will need a length of 3/8 in hose to reach from the pcv location around the back of the plenum and up to the center of the plenum where the vacuum tree is. If you are lucky enough to have a 3/8 in nipple cap you can cap off the stock nipple at the back of the plenum, if not take a short piece of 3/8 hose and install a suitable sized bolt in it and use it as a cap, crude but effective and cannot be seen anyway. Now hook the pcv valve to the length of hose and install the valve in the valve cover hole and route the hose around to the manifold tree. I have a 5-spd trans and have a spare hook up on the tree but I am not sure if this is used for the auto transmissions. If you have the spare unused connection just put the hose on with a small hose clamp to secure it as the size of this connection is a bit smaller than 3/8 in. If you do not have a spare connection you will need to go to your parts store for a "tee" to fit into one of the larger lines leading from the tree, perhaps the one that goes to the vacuum booster and hook in the pcv line there. I hope that this will help you achieve your quest for better running. SR."

 

I know that this is an old topic but I had to respond. I had an 81 F100 w/ 300 i-6 that had oil getting into the breather filter. Turns out that the oil is caused by blow-by..meaning that the rings on the piston are shot and they aren't forming a seal in the chamber which is causing oil to blow by and into the air filter...if it hasn't been fixed, have your compression checked.