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Unexplainable stuff in the Oil Filler Tube

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Old 12-08-13, 04:50 PM
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Unexplainable stuff in the Oil Filler Tube

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Has any body ever seen this inside there Oil Filler tube?
I was at my shop today changing a vacuum hose when i decided to just twist open the Oil Filler cap. Not expecting white gewy crap to be in there. I checked my Dip stick right after, but no sign of milky oil or anything out of the ordinary.

I Did do an oil change (the first oil change ive done on this car actually) a couple weeks ago. I've used Shell 20w-50 not that i think it has to do anything with that stuff being in there, but hey you never know!

Its a 10 Anniversary BTW (My first car/first rotary)
Car is Completely Stock Except for a Cold air intake and Exhaust.
Old 12-08-13, 05:39 PM
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condensation.
..called "Lung mustard" by some guys.
It's somewhat normal.

BUT if you find you are having any coolant issues,then NO it is not normal.
Old 12-09-13, 12:31 AM
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Yes condensation caused by coolant in your oil, or water in your oil. If you haven't already solved the issue, just do an oil change after you run a little engine cleaner through it. Make sure to follow the instructions because even I don't trust that stuff. But it does get gunk out.good luck!
Old 12-12-13, 07:24 PM
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No coolant problems for sure. Is there a remedy too preventing this so called "lung mustard"?I've seen a couple of threads of guys drilling holes on the oil cap. Not to fond of that idea since I'm a stickler for stock! What does Mazda say about that stuff? Any TSB's on it?
Old 12-12-13, 09:35 PM
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https://www.rx7club.com/showthread.p...171&styleid=16
Old 12-12-13, 09:42 PM
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I don't know if you can get rid of it easy or not but I've seen it in other cars as well.
Old 12-13-13, 10:42 PM
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Happened to my 86, change the oil and drive a bit more.
Old 12-14-13, 07:09 PM
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I don't know about your modern car, but on an fb run a tube with a pcv valve to a vacuum source.
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