Engine/Power - EJ25T (STI and 2006+ WRX) Discussions about the USDM 2006+ WRX and WRX STi 2.5 liter turbo flat-four.

Anyone tried "seafoam"?

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Old Jul 29, 2013 | 12:16 PM
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Tren Hard's Avatar
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Anyone tried "seafoam"?

Hey my stepfather uses this in his Nissan pathfinder and he loves it. Asked if I wanted to use it. Was unsure if it was safe for my car. Anyone used this stuff?

His pathfinder has 212k miles on it and says it drives better now than it did at 125k miles when he just started using it. His car has never had any major fixes to the engine either, all stock and still runs strong. Here's a pic of the container.



Anyone tried "seafoam"?-image-4241141815.jpg
Old Jul 29, 2013 | 12:35 PM
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Maybe you want some slick50 to go with it?
Old Jul 29, 2013 | 12:50 PM
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I have used it on the 04 WRX and the 99 legacy but only through the intake.


It is good for a cool smoke screen for sure.

The difference in drivability was nominal if any although I know others who rave about it. I think it is more for piece of mind. I have not yet seen engines with comparable miles/usage opened and examined where one was using seafoam regularly and one.

When I cleaned the top of the pistons on my EJ251 donor block just before the build, seafoam did the absolute best job (of all liquid cleaners I used) for actually dissolving and removing the carbon deposits.

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FYI Subaru makes an upper engine cleaner that is essentially the same thing. There are TONS of threads on multiple forums about seafoam use in subaru's if you have a good 36 hours to kill reading them.


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Last edited by Harry Maneuvers; Jul 29, 2013 at 12:59 PM.
Old Jul 29, 2013 | 01:06 PM
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Old Jul 29, 2013 | 06:59 PM
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Originally Posted by Harry Maneuvers
I have used it on the 04 WRX and the 99 legacy but only through the intake.

It is good for a cool smoke screen for sure.

The difference in drivability was nominal if any although I know others who rave about it. I think it is more for piece of mind. I have not yet seen engines with comparable miles/usage opened and examined where one was using seafoam regularly and one.

When I cleaned the top of the pistons on my EJ251 donor block just before the build, seafoam did the absolute best job (of all liquid cleaners I used) for actually dissolving and removing the carbon deposits.

Before:

After:

FYI Subaru makes an upper engine cleaner that is essentially the same thing. There are TONS of threads on multiple forums about seafoam use in subaru's if you have a good 36 hours to kill reading them.
Thanks for the info man. Appreciate it! Think ill pick up some "upper" tomorrow. Can't wait to buy time exhaust for my car next.
Old Jul 29, 2013 | 09:19 PM
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Every dealer has something like that and they charge a lot for it usually. I've had it recommended to me a few times on higher mileage cars but really never saw a big need for it. My S13 had 222K mi on it and it still ran great. How many miles on your car?

Last edited by 04GG; Jul 29, 2013 at 09:21 PM.
Old Jul 30, 2013 | 12:59 AM
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Originally Posted by 04GG
Every dealer has something like that and they charge a lot for it usually. I've had it recommended to me a few times on higher mileage cars but really never saw a big need for it. My S13 had 222K mi on it and it still ran great. How many miles on your car?
76k rightnow
Old Jul 30, 2013 | 07:37 AM
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There are no doubt some deposits on the car at that mileage, but it is still low enough that I probably wouldn't do it if the car is running fine.
Old Jul 30, 2013 | 08:09 AM
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Doing it at lower mileage rather than higher helps get deposits now before they become larger. I wouldnt myself rush right out to do it but if you have the can, the time and know what your doing why not?
Old Aug 7, 2013 | 11:18 AM
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ive had very good results with it in past cars. made it a standard part of oil changes. lil bit int he fuel, and oil a few miles before a change, then smokescreen it via intake then change oil/filter.

car always runs noticeably better. you can let the deep creep set up on top of the valves overnight if you have bad deposits there.
Old Aug 9, 2013 | 10:29 PM
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Originally Posted by iin10ded
ive had very good results with it in past cars. made it a standard part of oil changes. lil bit int he fuel, and oil a few miles before a change, then smokescreen it via intake then change oil/filter.

car always runs noticeably better. you can let the deep creep set up on top of the valves overnight if you have bad deposits there.
Thanks mate. I'm gonna go through with doing it all tomorrow. Oil change in how many days later, 100miles?
Old Aug 9, 2013 | 11:02 PM
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Ehh, prevailing wisdom is 200-500 miles. With your miles, prolly only 200. Just did mine and it helped idle and throttle response. 2002 at 106K, stock.

Also confirmed an exhaust leak I suspected.

Last edited by oaklandish_WRX; Aug 9, 2013 at 11:06 PM.
Old Aug 9, 2013 | 11:05 PM
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Like others have said, if you have the can and the time, definitely do it.

I've done it before in both my gas tank and through the intake. The seafoam through the gas tank doesn't make much of a difference (as far as I could feel), but the seafoam through the intake was a big help.

If you do seafoam through the intake, you'll need an extra pair of hands. Have a buddy help you with it.

Let us know how it goes!
Old Aug 9, 2013 | 11:06 PM
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as far as the oil change goes, look at your oil dipstick often and you should be able to see how effective it its.
Old Aug 21, 2013 | 08:34 AM
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Throw some tren in engine, built immediately.
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