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Old 09-13-2017, 07:17 PM   #1
Mr_Happy
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Default Coolant Droplets Popping Out of Oil Filler Tube

05 STI with 145k miles.

I'm having some issues with oil consumption (I believe) and went to check for smoke out of the oil filler cap. There's no smoke, but when I was looking around I noticed droplets of something spraying out. Grabbed a paper towel to try and catch some and sure enough it's coolant. They were light green droplets appearing on a clean paper towel. This was done with the engine warm, but the coolant was not at full operating temp, although it was near it.

Coolant in the overflow tank is totally fine in color, and the upper coolant res and radiator are as green as can be. The droplets were definitely a much lighter green than the coolant in the upper res and radiator, but absolutely still noticeably green.

Any thoughts? I hesitate to believe it's the head gasket as my last oil change was normal as can be and the EJ257 isn't exactly known to have head gasket issues.
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Last edited by Mr_Happy; 09-13-2017 at 10:49 PM.
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Old 09-14-2017, 12:55 PM   #2
winston856
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Quote:
Originally Posted by Mr_Happy View Post
05 STI with 145k miles.

I'm having some issues with oil consumption (I believe) and went to check for smoke out of the oil filler cap. There's no smoke, but when I was looking around I noticed droplets of something spraying out. Grabbed a paper towel to try and catch some and sure enough it's coolant. They were light green droplets appearing on a clean paper towel. This was done with the engine warm, but the coolant was not at full operating temp, although it was near it.

Coolant in the overflow tank is totally fine in color, and the upper coolant res and radiator are as green as can be. The droplets were definitely a much lighter green than the coolant in the upper res and radiator, but absolutely still noticeably green.

Any thoughts? I hesitate to believe it's the head gasket as my last oil change was normal as can be and the EJ257 isn't exactly known to have head gasket issues.
Head gaskets are really the only way coolant could come out of the oil filler cap. I believe there is a test which can be done to see if there are hydrocarbons in the coolant.

Other than that, do a compression and leak down test.
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Old 09-14-2017, 01:08 PM   #3
Charlie-III
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Quote:
Originally Posted by winston856 View Post
Head gaskets are really the only way coolant could come out of the oil filler cap. I believe there is a test which can be done to see if there are hydrocarbons in the coolant.

Other than that, do a compression and leak down test.
Agreed......but, how does coolant get into the oil and then "splash out" and remain green? I would guess it would have some oil in it.
Just a comment.

Leakdown and compression test "may" find a HG leak. In the service forum, there is a fresh HG testing thread where a coolant pressure tester is used to help find a bad HG. I was posting in it, but should be easy to find.
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Old 09-14-2017, 02:36 PM   #4
Mr_Happy
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I took the car to a local dealership because I could getin quickly and they found no reason to do a compression and leakdown test, whatever that really means. For that I am just going to switch back to my previous oil and see what happens with it.

I will look into the testing to look for the bad head gasket. Sounds like a much better option than just replacing them out of suspision.

Ill also add that the "green" droplets that fly out of the filler tube (literally fly out) are a much lighter shade of green than when I dropped a paper towel in the upper res and radiator to collect coolant. Someone suggested it to be condensation, but the motor was entirely warm this next time it occurred. Its a bit strange. Even searching I have never heard of a bad head gasket to make coolant drops fly through the filler tube.

Any chance this is a PCV issue?

Last edited by Mr_Happy; 09-14-2017 at 02:52 PM.
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Old 09-14-2017, 03:29 PM   #5
Max Capacity
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Any decent repair shop will have a HC tester (hydro-carbon), call a few shops and ask if they have one.


Has it always been on the stock tune ?

May be call Rey at www.AZPinstalls.com in northern NJ they are a great Subaru shop.
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Old 09-14-2017, 03:37 PM   #6
Mr_Happy
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Originally Posted by Max Capacity View Post
Any decent repair shop will have a HC tester (hydro-carbon), call a few shops and ask if they have one.


Has it always been on the stock tune ?

May be call Rey at www.AZPinstalls.com in northern NJ they are a great Subaru shop.
Ive been to AZP before. Unfortunately for me theyre over 3 hours away.

The car has had various tunes as mods have been put on it. This is the first time I have noticed this happening, but I dont leave the car running very often with the oil cap off. For all I know this has been going on since I got the car 6 years ago. I have no idea.
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Old 09-14-2017, 04:49 PM   #7
Max Capacity
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An oil sample sent off to Blackstone Lab's will tell whats in the oil.

It's something you should do to learn how good your oil and engine are.
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