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Excessive moisture in oil #5332083 01/25/20 06:47 PM
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mb32 Offline OP
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I noticed that my 2006 G35 has excessive moisture in the oil as the oil cap has a good deal of white condensation underneath. The car is driven short trips but I have not had the problem before.

I took the car for a good drive on the highway for 40 minutes but the condensation is back within a week. Coolant is clean and no signs of contamination or coolant loss. The dipstick is clean.

What would be causing this excessive condensation to build up?

Re: Excessive moisture in oil [Re: mb32] #5332105 01/25/20 07:03 PM
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The cold weather.


-Colton
2002 Ford Crown Vic PI 207k, Ex-Kootenai County, ID Unit #42
Down for engine swap
2003 Ford Crown Vic PI 86k
Pennzoil Conv HM 5W30, Fram XG2
Re: Excessive moisture in oil [Re: mb32] #5332108 01/25/20 07:08 PM
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Traction Offline
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PCV valve?


Certified Tire Service Instructor since 2009
50 Chevy Fire Truck
13 Tahoe Pursuit
97 C5 Corvette
00 BMW M Roadster
02 Camry
12 Camry
81 Camaro
55 Chevy C4
Re: Excessive moisture in oil [Re: mb32] #5332111 01/25/20 07:10 PM
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totegoat Offline
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The cold combined with not running engine at temp long enough.

Re: Excessive moisture in oil [Re: totegoat] #5332156 01/25/20 08:03 PM
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SteveG4 Offline
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Originally Posted by totegoat
The cold combined with not running engine at temp long enough.

+1. Recently told my oldest to take his sportwagen for a few long drives in Alaska because of his short-tripping moisture under the oil cap. That advice worked.
BTW, he runs Mobil-1 Euro 0W-40 as he should. That and the similar Castrol oil is good stuff.


Somewhere between Alaska and Wisconsin...
2006 Silverado LT Crew Cab 4WD & 2013 Equinox AWD
Re: Excessive moisture in oil [Re: mb32] #5332185 01/25/20 08:40 PM
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Mad_Hatter Offline
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Originally Posted by mb32

What would be causing this excessive condensation to build up?

If you're confident it's not coolant than it's cool, damp air and/or blow by in conjunction with not driving the car enough to burn off the moisture. In the winter I have a hard time keeping the engine temp high enough to burn off moisture simply due to the cooler ambient temps. Driving around town won't do it.. you need long runs on the highway.

Last edited by Mad_Hatter; 01/25/20 08:42 PM.
Re: Excessive moisture in oil [Re: mb32] #5332210 01/25/20 09:06 PM
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Chesterr Offline
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I run it for 15 minutes with oil cap off to let yellow moisture escape in my 05 cavalier. A little messy but i do not care in this old car....you would have to add some oil afterwards. Leo, NH ....excessive moisture also shrinks filter so change that every 3 k in winter.

Re: Excessive moisture in oil [Re: mb32] #5332241 01/25/20 09:35 PM
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BrianF Offline
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Pull the dipstick, if it's not frothy white, your probably fine. My trailblazer always has had the white froth on the oil cap in the winter. 244,000km and 24,000km oil changes and it runs like a top. I change by km driven not time or season.

Don't overthink it. Just drive. I you can sleep at night do an oil analysis and get empirical evidence instead of bench racing.

Last edited by BrianF; 01/25/20 09:35 PM.

2006 Trailblazer LT. QSUD, Fram Ultra.
2017 Ram 3500 SLT Megacab. Duron SHP 10w30, Baldwin BT7349.
1993 GMC 1500. QSAD, Fram PH5
Re: Excessive moisture in oil [Re: mb32] #5332305 01/25/20 10:57 PM
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5AcresAndAFool Offline
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I had a Kia that I short tripped continuously in cold weather, it built up condensation like you describe. As long as your not getting coolant in the oil your fine. Only thing that will prevent this is getting the engine up to full operating temp frequently.

Re: Excessive moisture in oil [Re: mb32] #5332362 01/26/20 12:27 AM
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mb32 Offline OP
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I'm wondering if a bad PCV would cause this. I'm driving the same route/conditions as previous winters and never had any condensation under the cap previously.

Last edited by mb32; 01/26/20 12:27 AM.
Re: Excessive moisture in oil [Re: mb32] #5332457 01/26/20 07:56 AM
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bullwinkle Offline
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Engines that have the fill cap elevated up off the oil pan seem to be worse for this issue, almost all Ford gasoline engines (esp.vans) seem to have it in winter. As long as it disappears in warmer weather, my Grand Marquis even had it in warm weather due to a weak thermostat, a new 195F Superstat cleared that right up.


06 Ram 3500 CTD 4X4(FG Venturi), 89 F-450 7.3, 98 XJ 4.0(XG8A), 05 xB(XG3600), 18 Transit 3.7 (MC), 03 Merc Grand Marquis 4.6 2V(XG2), 11 Express 3500 6.0 (Fram PH10060 for now)
Re: Excessive moisture in oil [Re: mb32] #5332687 01/26/20 01:11 PM
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Mad_Hatter Offline
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Originally Posted by mb32
I'm wondering if a bad PCV would cause this. I'm driving the same route/conditions as previous winters and never had any condensation under the cap previously.

Possible. If combustion gasses are backing up it stands to reason that more contaminants, including water, will be found in the oil. Buy a new one and see what happens... also, check your oil cap and dipstick to make sure it's getting a good/tight seal. A bad pcv can sometimes cause a dipstick to pop out creating a point of ingress for contaminants.

Re: Excessive moisture in oil [Re: mb32] #5333057 01/26/20 07:51 PM
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mb32 Offline OP
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Okay I pulled the line to the PCV and it was full of milkshake condensation, and the valve was plugged full. Cleaned it out real well until I could hear the valve rattle. There was good vacuum on the PCV hose so looks like the blockage was only at the end where the valve sits.

I did replace the valve covers last year and I am wondering if the aftermarket PCV valve isn't working as intended like the original one. I took the car for a good drive on the highway keeping the revs between 3-4k RPM to burn off any residual condensation in the engine. Will monitor for now, but hopefully the condensation goes away. If not, will re-inspect the PCV and replace with new one.

Re: Excessive moisture in oil [Re: mb32] #5333301 01/27/20 01:17 AM
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Mad_Hatter Offline
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Originally Posted by mb32
Okay I pulled the line to the PCV and it was full of milkshake condensation, and the valve was plugged full. Cleaned it out real well until I could hear the valve rattle. There was good vacuum on the PCV hose so looks like the blockage was only at the end where the valve sits.

I did replace the valve covers last year and I am wondering if the aftermarket PCV valve isn't working as intended like the original one. I took the car for a good drive on the highway keeping the revs between 3-4k RPM to burn off any residual condensation in the engine. Will monitor for now, but hopefully the condensation goes away. If not, will re-inspect the PCV and replace with new one.

Sounds like a plan.. could be the blockage was also popping your dipstick out and moisture could make it's way in that way too. Did you check your oil cap for a tight seal?

Re: Excessive moisture in oil [Re: mb32] #5333343 01/27/20 06:44 AM
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JoelB Offline
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I've noticed this recently on our new corolla. I can't stop the short trips so I wipe out the cap occasionally so it doesn't build up.


Mine: 2020 Corolla SE
Factory fill
OE Filter

Wife's: 2018 Chevy spark 1.4 Non-turbo
Mobil 1 0w20 AFE
ACDelco UPF64R
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