for starters how many miles? if it is high milage you are going to have lots of blow by + the high probability of a clogged crank case breather. there should be 2 on your vehicle the one on the back of the valve cover is just a breather tube. disconnect it from the air box and see if you can suck(be carefull not to use your longs just do it with your mouth/cheeks that air in there is some nasty sh$%) if it is clogged you can either try and unclog it with a bent paper clip or order a new one. the one on the front is sort of on the side and conects to manifold vacume through a "metering orafcae" it is not a PCV valve it should not rattle. usually what happens is the metering oraface gets cloged and no longer pulls crank gases through to the engine after a while the breather is over loaded and clogges too, forcing the execess gas to get out however it can. so first clean up the breather that will stop the oil from coming out the dipstick tube. then take out the vacume "metering oraface" and clean it out, or just buy a new one. I modified mine with a bigger hole because i have so much dang blow by, its really easy just drill a bigger hole the engines don't have a mass airflow sensor so the added vacume load won't do much to the engine.