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  #1  
Old 01-27-2013, 03:52 PM
buzzvoodoo buzzvoodoo is offline
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Default Oil Cap Yellow / white sluge normal?

I was checking my trucks fluid levels today and took off the engine OIL cap. LOTS OF YELLOW froth build up on the cap. I called my friend who owns his own repair shop (40+ years car repair) and he informed me that it is normal on the 4.7L engines because moisture gets into the cap area / PCV system and develops on the cap.

I called up a 2nd friend who is ASC certified and he said not to worry about it as well because moisture in this cold weather gets into the system and builds up as yellow / white residue. He told me that if you check most trucks out on the road right now you will most likely see the same reside build up.

I was curious if anyone else has noticed this build up on their oil cap. If not can you guys please help a member out and check your oil caps and report back with the findings?

INFO
29 deg F temperature outside.
139K miles 4.7L bone stock.
Oil on the check engine dip stick looks normal.
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Old 01-27-2013, 04:17 PM
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It is normal on the inside of that cap
shine a light down in the engine, i doubt if you will see the same moisture build up

many moons ago, motor oil was refined differently, & you could not use one brand at one oil change, then a different brand the next time,
Some were not compatible & would cause a similar build up on top of the heads
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Old 01-27-2013, 04:21 PM
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I have not personally experienced this, however I have read about it a few times, and I called my service manager at the dealership I work with and he too said that it is normal and not to worry

Thanks
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Old 01-27-2013, 05:18 PM
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Yup, normal.

There is even a TSB out there for re-routing the PCV hoses to reduce it.
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Old 01-27-2013, 06:27 PM
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Yup, even the 3.7 and 5.7 we have gets it up there. If you still have the funny looking contraption inside your oil fill, that's why it's there. There was a TSB to put those in to kind of hide it from the consumer.
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Old 01-27-2013, 06:35 PM
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Hello, Buzzvoodoo. Welcome to the club. I remember when I first saw this a few years ago on my own 4.7. I nearly freaked out thinking I was about to blow a head gasket or something.

But no problem. I see it every winter.

Take care-
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Old 01-27-2013, 08:02 PM
Thetolleyman Thetolleyman is offline
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I second that, I freaked too!
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Old 01-27-2013, 09:13 PM
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I pulled the filler tube off and wrapped it with insulating tape, foil tape and filled the cap with insulating spray foam. Saw a thread on it somewhere and it worked great. Reduced the build up by 95%
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Old 01-28-2013, 09:06 AM
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Quote:
Originally Posted by HemiLonestar View Post
Yup, even the 3.7 and 5.7 we have gets it up there. If you still have the funny looking contraption inside your oil fill, that's why it's there. There was a TSB to put those in to kind of hide it from the consumer.
I pulled the oil filler cap off and looked inside of the filler port. I cant see more then 2 inches because this ODD black plastic contraption that is slanted to one side is blocking my view. What is the purpose of this little plastic thing? I am guessing they put it in there to prevent the yellow sludge from dripping down. I got a little lost when you mentioned about Hideing it from the consumer. How does this hide it? I still see a tone of yellow and white even with the TSB plastic contraption shoved in my oil filler cap.
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Old 01-28-2013, 09:12 AM
buzzvoodoo buzzvoodoo is offline
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By the way thanks buys. I almost had a heart attack when I saw this. I might also add its never a good idea to start poking around in the engine bay with the car running. ( running to checking transmission fluid ) you can always nick your middle finger on the radiator fan even with the fan shroud housing covering it. I got lucky it didn't take my finger off. I sawsomething odd that caught my attention.
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