Re: new to the jeep thang and have an oil problem
Eventhough a catchcan is a great thing to keep the air inlet and intake valves clean, i think that there is something wrong causing even the air filter to be dirty with oil. If the PCV valve doesn't help, it could be that there is some serious blowby from one (or more) of the pistons, causing a high airflow through the breather lines. A quick check could be done by removing the oil filler cap with the engine running and feeling if there is a lot of air coming out. Normally there isn't.
And regarding oil, there are a lot of personal preferences on the brands. I at least use 5W30 or even 0W30 synthetic oils. The later is a bit thinner when cold and lets the oil flow sooner to the bearings then the 5W30 oil. Most of the engine wear happens at startup when cold.
Both 5W30 and 0W30 are the same at operating temperatures.