03-06-2021, 08:04 AM
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#1
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Registered User
Join Date: Mar 2016
Location: Sicklerville, NJ
Posts: 69
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Oil cap looks moist. Should I be worried?
I'm changing the oil in my 99' boxster and I noticed taking the oil cap off was hard. Then when I got it off there was a weird moist oil residue on the top of the filler and the cap looked wet. Should I be worried?
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03-06-2021, 08:27 AM
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#2
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Registered User
Join Date: Mar 2016
Location: Sicklerville, NJ
Posts: 69
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Also the oil that came out looked fine. The dipstick looked normal. But I think my AOS might be going bad.
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03-06-2021, 08:40 AM
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#3
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Registered User
Join Date: Oct 2014
Location: California Central Coast
Posts: 1,476
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How do you drive your car? Lots of short trips that barely get engine warm? Looks to me like engine not getting hot enough to cook off water vapor. As far as AOS get a manometer and check.
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03-06-2021, 08:44 AM
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#4
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Registered User
Join Date: Mar 2016
Location: Sicklerville, NJ
Posts: 69
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Quote:
Originally Posted by 911monty
How do you drive your car? Lots of short trips that barely get engine warm? Looks to me like engine not getting hot enough to cook off water vapor. As far as AOS get a manometer and check.
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Just came from a long drive on the highway so it usually always gets up to temp. Is it possible the cap is going bad in letting moisture in.
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03-06-2021, 08:52 AM
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#5
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Registered User
Join Date: Oct 2014
Location: California Central Coast
Posts: 1,476
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Quote:
Originally Posted by CharlesE
Just came from a long drive on the highway so it usually always gets up to temp. Is it possible the cap is going bad in letting moisture in.
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The cap would show as an air leak. As engine cools water will condense inside the case. When you say usually always gets up to temp do you mean you get it to 180 deg and drive for 20 min or more or just gets there and then shut down.
If you are not short driving it then you may have other issues.
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03-06-2021, 10:49 AM
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#6
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Registered User
Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 6,649
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Quote:
Originally Posted by CharlesE
Also the oil that came out looked fine. The dipstick looked normal. But I think my AOS might be going bad.
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If your AOS was going bad, the sump vacuum level would be too high, which would help get rid of the moisture. Your problem lies elsewhere.
__________________
“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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03-06-2021, 11:37 AM
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#7
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Registered User
Join Date: Dec 2009
Location: Orange County, CA
Posts: 1,994
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Quote:
Originally Posted by JFP in PA
If your AOS was going bad, the sump vacuum level would be too high, which would help get rid of the moisture. Your problem lies elsewhere.
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Not enough driving, or perhaps too many short trips..?
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03-06-2021, 05:04 PM
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#8
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Registered User
Join Date: Feb 2017
Location: NorCal
Posts: 171
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Quote:
Originally Posted by Gilles
Not enough driving, or perhaps too many short trips..?
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I'm in this camp
__________________
2022 PCA Zone 7 Autocross Chair
2001 Boxster 986 (base) #414
-PCA GGR: Class Champion AX12 '18, '19, '20; CC06 '21; CC05 '22; PAX 5th '19, 3rd '20, '21, & '22
-PCA Zone 7: Class Champion P14 '18, '19; P02 '20; P-03 '22; PAX Champion '20 & '21
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03-06-2021, 06:14 PM
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#9
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Registered User
Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 6,649
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Quote:
Originally Posted by Gilles
Not enough driving, or perhaps too many short trips..?
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Possibly, but the water could be coming from an internal source as well.
__________________
“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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03-06-2021, 06:28 PM
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#10
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Registered User
Join Date: Mar 2016
Location: Sicklerville, NJ
Posts: 69
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Quote:
Originally Posted by JFP in PA
Possibly, but the water could be coming from an internal source as well.
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I drive it alot and i dont drive slow so i know its gets warm enough. I did notice a really slow coolant leak but I dont know where its coming from I just see the level drop every month or so. Could this be a factor?
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03-08-2021, 04:23 PM
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#11
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Registered User
Join Date: Dec 2009
Location: Orange County, CA
Posts: 1,994
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Quote:
Originally Posted by JFP in PA
Possibly, but the water could be coming from an internal source as well.
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Bad O-rings on the heat exchanger could be the cause for this issue as well..?
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Last edited by Gilles; 03-08-2021 at 05:22 PM.
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