2000 durango 4 7 what causes condensation build up in the oilcap you replaced the cap and stick but still get a lot of condensation and yellow creamy color stuff Any ideas to solve this or cause?

Answer 1

Was having the same problem. Guy at gurage said to use a oil flush to clean out the junk that build up in the engine. After the flush i had no build up for seversl years.

This happens because the pcv valve is lower than the top of the cap and the cap is ice cold, you will notice that you do not get the yellow sludge in the summer. what you need to do is either wrap the oil fil tube with insulation ( not too good of a fix) or the prefered way, drill and tap the oil cap with a 1/8 27 npt tapered thread and put a platic fitting with a quick release air disconnect into the hole. this can be purchased from Home Depot then disconnect the pcv valve air supply but leave the old valve in place to fill the hole. now run a 1/4 inch line from the fitting to an aftermarket pcv valve and reconnect to the vacuum line that was on the old valve. this will remove moisure from where it naturally occumulates (at the highest point.) this will also prolong your oil life and eventually your engine from pan sludge which causes oil pump failure. if you want some photos of the complete job e-mail me it is about a 10 minute job and costs about $2. you cant go wrong. Eric; lee_eric@sbcglobal.net

wouldn't suggest an oil flush unless you have them regularly as this could loosen a lot of gunk which will only end up in your oil pan, and then recirculate back in your engine.