Condensation in oil filler cap -

Go Back > Dodge Trucks > Dodge Ram > 3rd Gen Ram Tech
Log In 

3rd Gen Ram Tech 2002-2008 Rams: This section is for TECHNICAL discussions only, that involve the 2002 through 2008 Rams Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.

Condensation in oil filler cap

Thread Tools Search this Thread
Old 12-05-2011, 11:16 AM
04HemiGreg's Avatar
04HemiGreg 04HemiGreg is offline
Record Breaker
Join Date: May 2009
Vehicle: 04 1500 4x4 SLT Hemi
Location: Eastern, NC
Posts: 1,131
Default Condensation in oil filler cap

This is probably nothing but I thought I'd check it out here. I changed my oil yesterday (been running synthetic for the last 20k miles or so). When I pulled the oil filler cap off, several droplets of water fell out of it and I turned it over and the underside was somewhat wet. When I drained the oil, it didn't look milky at all and the oil actually still looked pretty good. Is this common and just a result of some condensation given that it's the time of year where it gets pretty cold at night but temps during the day are still often in the 60's or low 70's? Or do I have water getting in my oil somehow?

2004 1500SLT Sport QC Hemi 4x4; Leveled; 35" Nitto Mud Graps on 17" Moto Metal 951's; True Duals
Reply With Quote
Old 12-05-2011, 11:58 AM
MikeHTally's Avatar
MikeHTally MikeHTally is offline
Join Date: Aug 2007
Vehicle: 2003 1500 QCSB Hemi 4x2
Location: N. Florida
Posts: 4,536

That is not a good thing. Hopefully, it's just condensation (likely is). How far is your commute? That is often the result of the engine not getting hot enough to burn off the condensation that occurs. Common issue in colder weather.
2003 1500 QC Hemi

2006 Chrysler 300C 2008 1/2 Mazda Speed3
Reply With Quote
Old 12-05-2011, 01:04 PM
dirtydog's Avatar
dirtydog dirtydog is offline
Moderate User
Join Date: Oct 2008
Vehicle: 2008 Ram QC 4x4 BigHorn
Location: Albany, NY
Posts: 10,975
Send a message via Yahoo to dirtydog

Sounds like condensation from large temp fluctuations. If the night temps are prett cold, the oil is cold at daylight, and since oil is pretty thick and blocked from the sun, the outside ambient temp starts raising the oil pan temperature all while the oil is cold. This creates condensation on the oil pan.
Moisture under the cap can be from same thing, along with short duration trips like to the store and back. You can have a perfectly dry internal engine that drips water off the filler cap like yours did when temps change. It's called Dewpoint and creates moisture.
Reply With Quote
Old 12-05-2011, 02:03 PM
NV290 NV290 is offline
All Star
Join Date: Apr 2008
Vehicle: 11' Dodge Ram 1500 4X4 QC
Location: Mass
Posts: 770

It's been happening on my trucks and freinds trucks for years and thousands of miles. I even asked the dealer who said they too see it all the time. Not something i would worry about. It's caused by what Dirty describes. My wifes Dodge Intrepid has the issue as well.
2011 Ram Big Horn 5.7 1500 4X4 QC. Air Bags, Bedslide, Mirror Tap/Blendmount, Kenwood DNX571HD, Alpine amps, JL Audio sub, Kicker upgrade, Back-up camera, RAM Lockbox, AMP Bedstep, Cabin filter mod, Rigid Dually flush Back up lights, V-leds license plate b/u light, SR-Q2 flush driving lights. Spyder LED Tail lights.
Reply With Quote
Old 12-05-2011, 02:27 PM
04HemiGreg's Avatar
04HemiGreg 04HemiGreg is offline
Record Breaker
Join Date: May 2009
Vehicle: 04 1500 4x4 SLT Hemi
Location: Eastern, NC
Posts: 1,131

Makes sense guys and thanks. I work from home and there are days my truck never even gets started and then days where I drive it to run errands. I drive it long enough to get to full temp but probably not long enough to get rid of all the moisture. That, along with the fact that it is that time of year. 30's and low 40's at night and up to low 70's in the day. I do take the occasional road trip that would probably more than get rid of the condensation.

2004 1500SLT Sport QC Hemi 4x4; Leveled; 35" Nitto Mud Graps on 17" Moto Metal 951's; True Duals
Reply With Quote
Old 12-05-2011, 02:30 PM
HammerZ71's Avatar
HammerZ71 HammerZ71 is offline
Dodge Forum Administrator
Join Date: Jul 2007
Vehicle: 2014 2500 CTD 4x4
Location: South Georgia/East Florida
Posts: 24,559

It's absolutely nothing to worry about as long as the oil has no signs of contamination when you drain it.

Lot of contributing factors cause it, weather changes and especially driving a lot of short trips where the engine oil does not sustain high temperature enough to burn off the condensation that naturally form...
2014 Ram 2500 Big Horn Cummins 6.7 4x4
Reply With Quote
Old 12-05-2011, 04:10 PM
FORANE's Avatar
FORANE FORANE is offline
Join Date: Sep 2011
Vehicle: 2006 DODGE RAM 3500 QCLB CUMMINS 4X4
Posts: 44

This sort of thing is seen in aircraft engines also. It is said that auto engines wear out while aircraft engines tend to rust out. This is because auto engines tend to be run more frequently while aircraft may sit for weeks to months between flights. I have seen completely rust coated cylinder walls after an engine sitting 1 year.

When the temperature drops to the dewpoint, fog will form. In the engine that will be seen as your condensation. Yes, it needs to be run until it is hot to hone the cylinder walls and evaporate the condensation.
Reply With Quote
Old 12-05-2011, 11:23 PM
butch1581 butch1581 is offline
Join Date: Oct 2005
Vehicle: 2006 Dodge 1500 Big Horn
Location: Neenah WI
Posts: 629

Mine is dripping wet all the time. I dont like it, but is has not caused any issues. I park my truck in a heated garage in the winter, so it's constantly going from warm to cold... I wipe it out with paper towel when I think of it...
Supercharged 2006, 5.7, Extractor Hood, Nitto 295-70-R18 Trail Grapps, 4:56 gears, Bilstein Level, Custom Tune, Infinity 10" sub, Window Tint
Reply With Quote
Old 12-06-2011, 06:11 PM
spuldup's Avatar
spuldup spuldup is offline
Join Date: Aug 2008
Vehicle: 2006 Ram 1500 QC 5.7 4X4
Location: Central OH-IO
Posts: 72

Just noticed this in my truck tonight when adding 1/4qt. Had pooling in the cap even after I turned it upside down. My commute is 1.2 miles 3-4 days/week. Occasionally I do have a 500 mile road trip or errands of course.

Anyone reckon the passive breather used in my CAI setup would create more condensation than the factory airbox with an actual breather under negative pressure? I have thought of sticking the factory box in till March. This is mid Ohio, USDA zones 5-6.
Reply With Quote
Old 12-06-2011, 11:23 PM
Bent Bent is offline
Join Date: Feb 2010
Vehicle: '04 QC SB 4x4 SLT 1500
Location: Pinawa, MB, CANADA
Posts: 312

when we run a standby gas engined generator on a test cycle every month, we put it under full load for thirty minutes at operating temperature for just this reason.
Reply With Quote

Similar Threads
Thread Thread Starter Forum Replies Last Post
A/c Deacon25 2nd Gen Ram Tech 4 09-23-2015 08:36 AM
Problem refilling antifreeze...need help. wralyn 1st Gen Durango 6 09-22-2015 12:59 PM
Condenser Fan vibration 2007 QC 1500 rover88 3rd Gen Ram Tech 8 09-17-2015 08:43 PM
Can't find Evap Purge Solenoid 1997 Stratus 2.4L jlindseyjr Dodge Stratus 2 09-16-2015 11:25 AM
PCV Valve MoparMack 3rd Gen Ram Tech 3 09-11-2015 09:02 PM

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump


All times are GMT -4. The time now is 01:07 AM.