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Old 02-19-2011, 08:31 PM   #1
Scooby Newbie
Member#: 216688
Join Date: Jul 2009
Location: Richmond, BC
2005 2.5rs
aspen white

Default oil filler sput has white goop..!!

So, i decided to do an oil change today everything was going well untill i was about to pure the new oil into the oil fill spout....in the spout there seems to be this brownish foamy looking substance..around the top and a bit into the neck of the spout... should i be worried? the old oil from what i see didnt have any of the white foamy liquid. My car is an 05 impreza 2.5rs, 5mt, with approx 91,000km
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05rs_will is offline   Reply With Quote
Old 02-19-2011, 09:55 PM   #2
Scooby Specialist
Member#: 102984
Join Date: Dec 2005
Chapter/Region: MWSOC
Location: Northbrook, IL
2005 2.5RS 4EAT
Platinum Silver


If the oil is a milky white color, that means there's water mixed with the oil.
If the oil that came out doesn't have it, it most likely means some water got into contact with some residue on the spout. Since there not enough heat in that exact area, the water didn't evaporate off with the exhaust. I would say it's not a problem if there isn't any of that stuff in your used oil.

Even if there is a moderate amount, anything that is goopy, the filter will catch and the stuff that does get through will have the water content vaporized off returning it to it's regular state.

Just clean it and be on your way.

The water can be from coolant or something else. Perhaps you got some coolant splashed in that area?
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Old 02-19-2011, 10:05 PM   #3
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Member#: 250463
Join Date: Jun 2010
Location: Evanston, Il
2010 Impreza 2.5i


If it's only inside the spout or on the underside of the oil fill cap and the oil doesn't look milky, then it's nothing to worry about. It just means that you haven't been getting the car up to operating temp for long enough lately.

Water vapor will collect in the crankcase and mix with the oil. If you drive long enough it will eventually be boiled off and sucked through the PCV system. If you don't drive long enough it will mix with the oil and collect in the cooler parts of the motor, most notably the underside of the cap.
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Old 02-22-2011, 12:45 PM   #4
Scooby Newbie
Member#: 216688
Join Date: Jul 2009
Location: Richmond, BC
2005 2.5rs
aspen white


ya the oil was fine no milkyness, so does it mean i need to warm up my car before i actaulyl start driving or make longer drives? thanks for the help, much appreciated
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Old 02-22-2011, 09:47 PM   #5
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longer drives would be better than letting it warm up at idle. the latter is not so good for for engines.
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Old 03-01-2011, 07:05 PM   #6
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Join Date: Aug 2010

Majority of the time its the crankcase that needs ventalation, i had to replace the PCV valve on my 00' RS due to the same problem in the oil filler spout.
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