I have a 99 dodge durango slt 4x4 it has the 5.2l v8 everytime I take the oil cap off there is milky oil on the threads of the cap and on the threads in the valve cover. I changed the oil and there is no water in the oil that I can find, none in the filter either, no signs of water on the dip stick, no smoke out the exhaust. I thought that moisture was getting through the seal on the cap so I bought a new one and its still there.

I do have to add antifreeze and oil to it regularly but it has over 256,000 miles on it, it burns and leaks some oil, and it leaks antifreeze from at least one freeze plug on the block. I can smell antifreeze while driving it and a bunch of other people said they smelled it too, but I might just need to clean the carpet.

I have a new set of valve cover gaskets that I need to install i just havent found time.

What could cause water to get in the valve cover like that?
I havent checked the pcv valve to see if it had milky water in it because I just now thought of checking that haha.

Thanks
Christopher

 

Sounds like you may need to replace the PCV valve.

 

I dont know if theres water in the valve cover with the pcv valve, but how would a bad pcv valve on one valve cover cause water to get into the other valve cover?

Ill check it tonight though.
Thanks
Chris

 

Do you have stock valve covers?

 

Yes sir its a stock 5.2, nothings been done to the engine except tune up stuff.
Only mods on the whole thing is step sides, and front grill guard. Its all stock, and any parts that were replaced were replaced with oem mopar parts.

 

I saw no milky oil in or around the pcv valve, I did replace the hose on the pcv valve because it was cracked.

 

If the hose was cracked then you were losing vacuum and the PCV valve was not working to full potential. You may want to check the vacuum port on the intake manifold and make sure there's not carbon build up inside that will cut down on the vacuum going to the PCV valve.

 

It probably is because at one point that hose was completely clogged all the way through.

 

A blocked hose means no vacuum to the PCV (Positive Crankcase Ventilation) valve which makes it useless. No crankcase ventilation means condensation which when mixed with oil turns milky colored. I do believe you found your problem.