causes of crankcase filter clogging very quick??

Well, check it then and take it from there.

 

I had the same problem with my ISX. I finally unplugged my sensor from the CVP housing and that stopped the codes. I took the whole sensor out of the housing and zip tied it to secure it. I did not unplug the sensor from the wiring harness. That will cause another code so leave the sensor connected to the harness. I would get an occasional code for "unusual CVP" in Insite because it was not detecting a pressure even though it was detecting a properly working sensor. Much better than the 100 error codes or more I was getting every day for excessive CVP.

First replace the CVP sensor. That is usually the problem. I had to replace the CVP sensor wiring harness. Mine had a spot rubbed off on it causing a short. So check the entire length of the harness also. Engine vibration will rub holes in many things you would never suspect.

If that does not help you can try drilling a hole in the filter, not the housing, towards the top where its the thinnest. That will allow it to breath without loosing much oil. That filter catches oil vapor and lets it condensate back into a liquid which it then returns to the crank case. A 1/2 inch hole will cause very little loss to the atmosphere. Beware though the EPA considers that tampering but its highly unlikely they will open your CVP filter housing and check it.

FYI if you have an ISX you should check out www.rawze.com its a thread site for all things ISX as well as ProStar with much helpful in depth knowledge.