Lol I could care less that it was on a toyota, those were the only pics I could find that looked like what I was seeing.

I still have the oil from the las change, time to open that bottle and see if any coolant separated me thinks.

 

The Ford Pinto didnt have a design flaw either. It was just nature when the car was rear ended by another car and exploded. If the oil fill was in a different location where cold air wouldnt constantly blow on it from the fan, there wouldnt be this kind of moisture build up with normal driving.

 

 

Chrysler changed the location of the PCV valve three times in three years in these third generation trucks. They must have known something about the design that didn't work in the first two. From what I've seen of mine, on the '07 4.7L is that it's on the passenger side rear of the engine, with the hose running to the filter box. The valve itself is just a small hole which meters the amount of flow rather than the conventional check valves of the past. I'm not entirely sold on this design, as I've noticed a dark oily patch on my air filter after several months. I also don't agree with the blowby gasses being sent to the intake via the throttle body, which, no matter how tight your engine is, will always leave a film of oily residue, especially as the engine ages. Hey, maybe I'm wrong about this design, and have totally misunderstood how it operates. I have yet to see the '07 design anywhere on paper and welcome any input.

 

I put a breather filter on my truck; the throttle body stays so much cleaner. Now if there was only something that I could do about the oil that comes from the PCV .... I have a catch can thats ready to be installed, i just havent figured out where/how to mount it.

 

To be honest I dont rightly know, When I found this it was the first change after the dealer did a change when I purchased it, I dont know what was in it before. Now it has mobil 1 full synthetic in it. I intend on changing it out again with only a grand on it to hopefully flush out anything that actually was in the engine from this.

One thing about it, there is no way that can be good to be in the engine. Pretty nasty tho.

Now I keep hearing that this is from the fan blowing cold air on the filler neck, well heck, why dont we just make a metal plate that looks kind like a v and block the air from hitting the filler neck...problem solved right?

 

Again, this is NOT a design flaw, or have anything to do with the PCV or oil fill location...

This happens on EVERY vehicle driven in a cold/humid climate especially when used for short trips.

The PCV is a closed system, that is not open to the atmosphere, so the location on the engine is irrelevant. The oil fill is also sealed when the cap is properly installed. Vented oil caps have not been used since the early '70s. Emissions laws require the crank case to have a sealed venting system, that is vented only to the air intake system or manifold.

BTW, those of you that have replaced your PCV tubes that run to your air filters with open to atmosphere breathers are doing more harm than good. Without the small amount of suction that is created through the air filter assembly, the crankcase fumes will not be pulled from the crank case, causing increased sludge build up, in the crank case. Also the very small amount of oil vapour that is pulled in through this side of the PCV system will help oil the top end of the cylinders. This does not reduce performance, contrary to what people would have you believe.

FWIW, I have ALWAYS ran closed PCV systems, without catch cans on my vehicles, performance oriented or not and have not experienced any oil deposits in the intake tract, even on my turbocharged vehicles. If you are experiencing noticeable oil build up, you should probably check the function of the rest of the PCV system, and other aspects of the engine.

 

I have never heard the locaton of the filler tube and the fan blowing on it... how does one think that would be the case? I am in agreement with Six Shooter... its from condensation made from constant large variations in temperature, short trips, and being a gasoline combustion engine with one by-product of combustion as water. Am I saying your cap should show this... NO. What I am saying is its not hugely uncommon in little amounts.

 

Thats it right there. If you look at the location of the oil fill tube, it has air from the fan blowing on it. Engine heat passes through the inside of the tube, is cooled by the air from the fan and creates condensation inside and that mixes with the oil. With no air moving past it, you wouldnt get any condensation as long as the engine was at operating temp. I have never seen this on a car where the oil fill is shielded by other engine components. While short trips are a factor, this can be seen in an engine that is beat hard and never does a trip under 50 miles. Short trips just make this problem worse. The error is not in the whole tube. It shouldnt be that large and out in the open where the contents inside can cool. If someone thinks this is natural or no big deal; start running the heating ducts for your house on the outside before you run it to all the rooms. Its just not logical.