'02 4.7L dodge ram with 72k mi. Just started having yellow foam under filler cap and neck. Not a little, much. Changed oil, checked a week later and it is starting to develop again. It didn't do this for 2 years, WTF? Oil looked good, brown as usuall, but not milky. Drive 60miles one way, every day. I know this has been talked about here and there, but don't know the latest. I am under the impression that my year motor already has the baffle. Called DC and they had no TSB on described issue. Thanks.

 

There's moisture getting in your oil somehow. Have you had any water leaks or run hot lately? Hope it 's not your heads or the gaskets.[&:]

 

This was discussed a couple of days ago. https://dodgeforum.com/tm.asp?m=16169

Nothing to worry about and nothing to do to fix it.

 

[:[:@]@]You shouldn't have any foam or milky substance under your oil filler cap or collecting on the valve cover baffles. Put a press. gauge on your radiator fill hole and pressurize the radiator. It should hold press. for a specified time. Also perform a compression check of each cylinder. Usually two adjacent cylinders with low press. indicate a head gasket leak as does a cooling system that can not hold press (provided the radiator and hoses are OK).

 

Truckie,

This is a common occurence with the latest emission controlled vehicles. I'd be happy to provide you with a link on a different forum where owners of many new cars have the same problems. This affects all brands, not just Dodges.

 

Well,

I think I found the cause. I read sgbofav's threads, and I think he is right. I was quite alarmed when I first saw it, for the reasons that the other posters here have mentioned.

That evening, after only a week on that oil, I flushed the crankcase and thoroughly cleaned the fill tube and cap with acetone. The oil still looked fine. Re filled it and ran around the corner and back and pulled the cap. It already was showing very slight signs of foam developing. What was tell tale was where it was developing. It was forming at the top of the fill tube and running down. It was not coming from the base of the tube (read, internal). This makes total sense from the hot/cold issue. After I pulled it into the garage, I immediately checked the temp of the block, valve cover and the filler tube. All were hot to the touch except the filler tube. It wasn't warm, it was cold! It is made of plastic that is not thermally conductive at all and is sitting in front of the engine right behind the radiator fan. I think I see why the baffle is there. It tries to isolate the path from the tube starting at the block to the PCV valve (which is sucking), from the very top of the filler neck, which being cold, will drop the hot oil vapor's water as condensation. Obviously, in this cold weather, it isn't working, but I am convinced that nothing is seriously wrong.

As a test, if I get time, I might insulate the filler neck, to let it hold some heat from the internal oil vapor and see if the condensation resides. That would absolutely confirm it.

 

I have a 2003 Dodge Ram 1500 with the same foamy mess in the filler tube. My problem is that the owner of the truck before must not have been to maintenance friendly as the baffle has melted and has a broken piece off the top.(so the baffle doesn't sit just right) I don't know if its safe to run without this baffle...any ideas???