I got a 92 Ford F250 and I was recently changing filters on it (its got the 5.0) and I noticed that the crankcase breather located in the air box always falls apart (i have had several of these types of trucks and they all did this) and I noticed there is always oil coming out of the tube. I was just wondering if this is normal or if something is possibly clogged? I also heard about something called "Blow By" and have no clue what that is or if this has anything to do with that? Thanks in advance!

It's possible that you may have either a clogged breather box or broken breather box hose. The breather box is located under the intake manifold. It is sometimes also called an oil trap.

Most likely a blocked crankcase breather filter. This is located just in front (from the driver's perspective) of the air filter box underneath the engine cover. You can either clean it in petrol then fully dry, or replace with an improved version, available from BMW.

The PCV valve does not control the oil situation, it just keeps the pans and valve covers from blowing off during a backfire. Excessive Oil in the breather is a result of excessive crankcase pressures, usually due to a worn engine, specifically rings.
SOME oil is normal, especially if you are loaded heavily and hard on the throttle.
There is a tester that measures crankcase pressures, but usually some other manifestation shows, like excessive oil consumption.

the PCV system draws crankcase fumes into the intake at idle and lower throttle situations. air going into the crankcase is filtered by the small PCV filter, where the oil shows up....

At highter throttle and lower intake manifold pressures, the system reverses, the PCV valve closes, and the fumes exit the crankcase VIA the breather filter. All of this is normal.

It costs tons less to periodically clean or replace the PCV filter.

you have a vacuum source in your crankcase.

I'm guessing there should be a tube or pipe that goes to the valve cover. Is the hole about a 1/2 inch in diameter? If so that's the fresh air intake for your "crankcase ventilation system". That hole should not be left open because, dirt and dust can can go directly into the engine and crankcase. There should be a tube, they are usually plastic.

spray some carb cleaner down the breather pipe the carb could be clogged up so it is not opening properly and choking the engine or flush out your feul they may be dirty and your not getting enough fuel through when you need it or your air intake senser might need changing cus if your air/fuel mix is wrong your engine will stall

It's the airflow sensor for your air filter. Change the filter and reset the sensor located on the air filter box.

1. There should be plastic intake housing with Air filter uinside. Usualy have 4 clips and sometimes screws. Open it up and filter should be in housing (square box). Do change breather filter also and PCV valve.

that would be a good idea,replace the filters before do anything else

the drain plug is located on the back of oil pan in the center. if you have a rock guard you have to remove this first. the pcv valve(positive crankcase vent is located on either the left valve cover in front or on theif it's a v6 or 8 or it is located on the valve cover in the back in a straight six it will have a hose that goes to your air filter breather box or the breather hose. please rate this...........thanks