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2016 XT Touring 5sp Manual
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21 Posts
Discussion Starter #1
Hi All,

I'd like do perform this on my gf's Forester. One of the valves was gunked up so badly that we had to replace the entire head (we bought it used).

Has anyone ever done this via the Deep Creep spray or the Seafoam Spray. I just ran a can through the fuel tank to excellent results.

I'd appreciate any advice anyone can offer for a good top engine clean methodology.

Thanks in advance.
 

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2015 2.5i Premium CVT
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373 Posts
I haven't gotten to use the spray yet however, I have used SeaFoam for years and love it for older cars and lawn equipment. I say go for it!
 

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2016 XT Touring 5sp Manual
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21 Posts
Discussion Starter #3
Thanks!

Yeah I'm just looking for someone who's done it before--I've read about a half dozen different ways to do it....
 
G

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There's a huge thread on this. Best way, and the only way to get even distribution to all cylinders, IMO, is straight through the front of the throttle body. Remove the intake system and unplug the MAF sensor, start it up (it will run rough because it's in limp mode from unplugging the MAF), and SLOWLY pour the SeaFoam into the throttle body, then shut off the car, reinstall everything, wait 30 minutes or so, and take it for a spirited drive until it stops creating a smoke screen. :biggrin:

The spray is much easier to use, just pull the trigger constantly, but placement is the same through the throttle body. Doing it through the throttle body also has the benefit of cleaning around the butterfly valve.
 

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2009 2.5xt 6 Speed Swap version 8 6 speed sti trans with r180
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4,150 Posts
I've used it on a friend's 01 Ranger that was running rough. Definitely picked up the power and mileage afterwards. Just followed the directions in the can and put it in the intake.
 

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2014 Impreza Touring Hatchback, CVT
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366 Posts
I’ve never done Seafoam in any of my vehicles but just picked up 2 cans. One is the liquid that I was going to put in the gas tank, the other is the aerosol can with that bendy straw. I’ll be going on a road trip tomorrow so was going to dump a can of it in the tank before I leave and will use about ¾ of a tank before I get to my destination. Once I get there I was going to do the aerosol can in the throttle body. Is it safe to do that when there is still a bit in the gas tank or will it be Seafoam overload?
 

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2015 2.5i Premium CVT
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373 Posts
No overload, you will be fine..
 

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2014 Impreza Touring Hatchback, CVT
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366 Posts
Ran the stuff in the tank and it seems to run a little smoother now. Then did the stuff through the throttle body. Not nearly as much smoke as some of the other videos I've seen though.
 

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2015 2.5i Premium CVT
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That usually means it is pretty clean.. I have had smoke that the neighbors must have thought the car was on fire lol.. Especially when I took it out on the road to let it blow out that way.. Looked like I had a James Bond Car
 

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2005 Forester X Auto
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317 Posts
Damn, my car isn't running rough but it sure does make me want to run out and buy some. I wonder if it would have any benefits for my 102K fozz
 

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2014 Impreza Touring Hatchback, CVT
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366 Posts
Damn, my car isn't running rough but it sure does make me want to run out and buy some. I wonder if it would have any benefits for my 102K fozz
My car has 155,000 km (~ 93,000 miles) and it seems to run smoother now.
 

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2019 Crosstrek 2018 XT
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14,583 Posts
Never used the stuff and all my vehicles run smoothe at well over 100K miles. I seriously doubt its necessary, but who knows. Now I do have to admit...I get on kicks that I add Marvel Mystery Oil to the tank once and a while.
 

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2015 2.5i Premium CVT
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Just what is that suppose to do besides waste money and thicken your oil???
 

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'19 Forester LTD CVT
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3,248 Posts
Never used the stuff and all my vehicles run smoothe at well over 100K miles. I seriously doubt its necessary, but who knows. Now I do have to admit...I get on kicks that I add Marvel Mystery Oil to the tank once and a while.
The smoke is worth it. At least, if your car actually smokes a bunch (mine didn't).
 

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2019 Crosstrek 2018 XT
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14,583 Posts
Just what is that suppose to do besides waste money and thicken your oil???
I don't add it to the oil I add it to the gas (like seafoam) Its really just another aromatic hydrocarbon with lots of solvents (like seafoam) It does improve gas mileage (while its in there)...but overall its probably a waste of money.
 

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14 Outback 25 Premium 4EAT
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120 Posts
Off topic: Marvel Mystery Oil works great for air tools. (never put it in an engine.)
 
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