Oil cap looks moist. Should I be worried?

[JFP in PA]

Originally Posted by Gilles

Not enough driving, or perhaps too many short trips..?
.

Possibly, but the water could be coming from an internal source as well.

[CharlesE]

Originally Posted by JFP in PA

Possibly, but the water could be coming from an internal source as well.

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?

[Jager]

Originally Posted by CharlesE

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?

First thing I thought of when I saw the photo is a coolant leak into the oil system. The residue under the oil cap is not normal. Hopefully it is something simple like the Oil Cooler.

[pilot4fn]

Depends also of the climate you're at.
We used to have 'normal' 20-30 years ago that if you do not get the car hot for a long time at least couple of times a week (if driven daily) during winter when the temps do hover between 30-0 F, then the oil cap looked just like on the OP's picture. Summer was never a problem.
Also, the coffee color stuff is so small amount, that makes me to believe the current colder weather could be the culprint of this - or very recently started small mix of water to oil.

[CharlesE]

Originally Posted by pilot4fn

Depends also of the climate you're at.
We used to have 'normal' 20-30 years ago that if you do not get the car hot for a long time at least couple of times a week (if driven daily) during winter when the temps do hover between 30-0 F, then the oil cap looked just like on the OP's picture. Summer was never a problem.
Also, the coffee color stuff is so small amount, that makes me to believe the current colder weather could be the culprint of this - or very recently started small mix of water to oil.

This sounds like it could be whats happening. I did let the car sit for a week so I dont daily drive it. I'm not worried about it but I'll try to find the coolant leak to see if its a problem. Thanks!

[blue62]

looking at your picture I see quite a bit of water droplets on the underside of the oil filler cap. Not good.
Also due to the fact that your slowly loosing coolant that makes the water droplets more suspect. So finding the reason for the coolant loose is rather important.

Things you can do:
Coolant system pressure test.
Test coolant system for presence of hydrocarbons, I think you can still get test kits for this at auto parts stores.
Send an oil sample out and have it tested for the presence of antifreeze.

[CharlesE]

Originally Posted by blue62

looking at your picture I see quite a bit of water droplets on the underside of the oil filler cap. Not good.
Also due to the fact that your slowly loosing coolant that makes the water droplets more suspect. So finding the reason for the coolant loose is rather important.

Things you can do:
Coolant system pressure test.
Test coolant system for presence of hydrocarbons, I think you can still get test kits for this at auto parts stores.
Send an oil sample out and have it tested for the presence of antifreeze.

Do you have a link to the tool to use to pressure test our coolant tanks?

[blue62]

Originally Posted by CharlesE

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?

First thing to do is pressure test the cooling system and see if you can determine why your coolant level is dropping and where it is going. Once you know the answer to where the coolant is going you will know if you need to be worried about the moisture on the oil filler cap or not.

[Gilles]

Originally Posted by JFP in PA

Possibly, but the water could be coming from an internal source as well.

Bad O-rings on the heat exchanger could be the cause for this issue as well..?
.

[911monty]

[QUOTE=Gilles;631655]Bad O-rings on the he heat exchanger could be a cause then, right?
.[/QUOTE

NO. This is physically not possible. 4 O-rings that contain pressures greater than atmospheric (oil at 15-50 psi and coolant at ~18 psi), cannot leak into each other separated by 2+ inches through the atmosphere @0 psi (14 psia) unless the O rings were gone and the leak was so bad they drained into the other from residual on the engine. But then I think the fluid on the ground would be hard to not notice.


Edit If I ruined a long standing joke like foglights then I apologize.

[flmont]

hopefully you have some oil that you could send out to get analyzed might help find the answer..

[djw8282]

Could be a cracked cylinder head..I would get it checked out before it gets worst.

[CharlesE]

Replying to my old dead thread just in case someone stumbles upon this thread...

The coolant leak I had ended up being a very small crack in the expansion tank.
Replacing it was a PITA but after that my coolant hasnt leaked.

My AOS also went bad shortly after this post.