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Old 03-18-2012, 16:58   #1 (permalink)
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Seafoam in high mileage engines

Hello, all. We have a bunch of high mileage minivans (all are over 250,000) and I have been pondering the use of Seafoam in these engines. I am comfortable with running it through the intake and in the fuel tank so lets not discuss that, but what is the wisdom of using it in the crankcase? The underside of the oil cap has lots of hard, crusty gunk on it and the valve train has alot of hard, brown gunk on it.

I would like to hear about the pros and cons of using Seafoam in the crankcase to clean this stuff. Would it clean that stuff out? Is it worth cleaning that stuff out? Would it clean out that stuff too well and cause troubles with plugging passages or sticking a relief valve?

Thanks for any thoughts about the Seafoam in the crankcase.
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Old 03-07-2013, 06:41   #2 (permalink)
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Re: Seafoam in high mileage engines

I am going back over some of my subscriptions and I found that no one had an answer for this. Does that mean no has any experience? I would love to hear from others.
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Old 03-07-2013, 09:14   #3 (permalink)
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Re: Seafoam in high mileage engines

I have never used any. Our fleet vehicles get replaced at 150k to 200k miles.
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Old 03-07-2013, 09:33   #4 (permalink)
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Re: Seafoam in high mileage engines

Heck, that's barely broke in! LOL!
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Old 03-07-2013, 09:45   #5 (permalink)
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Re: Seafoam in high mileage engines

Never used it but know of some who have used similar products over here . Split 50/50 .Some says it's great , others , dont let it near your engine unless as a last resort .Why not try it in one vehicle and see what results you get first hand ?
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Old 03-07-2013, 16:37   #6 (permalink)
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Re: Seafoam in high mileage engines

It does what it says, but at that many miles, you might want to wait until your just about ready for an oil and plug change. As far as recommendation for use, ultimately, using a quality oil and filter as well as keeping up with maintenance of the air intake and throttle body minimizes, if not eliminates the need for such a product. Also, the older the engine, the more likely you can have fouling or develop leaks. I've used it, noticed a slight change, but AI had all ready disassembled my throttle body and cleaned it.
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Old 03-07-2013, 17:26   #7 (permalink)
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Re: Seafoam in high mileage engines

Quote:
Originally Posted by CatSkinner View Post
It does what it says, but at that many miles, you might want to wait until your just about ready for an oil and plug change. As far as recommendation for use, ultimately, using a quality oil and filter as well as keeping up with maintenance of the air intake and throttle body minimizes, if not eliminates the need for such a product. Also, the older the engine, the more likely you can have fouling or develop leaks. I've used it, noticed a slight change, but AI had all ready disassembled my throttle body and cleaned it.
Thanks, Skinner. I was already cautious about it in a high mileage engine so it's good to hear that my fears aren't unfounded.

What do you mean by Maintenance of the air intake and throttle body?
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Old 03-07-2013, 18:25   #8 (permalink)
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Re: Seafoam in high mileage engines

Cleaning, verifying adjustments/parameters.
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Old 03-07-2013, 18:31   #9 (permalink)
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Re: Seafoam in high mileage engines

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Originally Posted by R.S.LOGAN View Post
Why not try it in one vehicle and see what results you get first hand ?
I was thinking of using it just before we get rid of one in the next couple of years. By then everything should be over 300,000 miles so lots of time for gunk.
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Old 03-07-2013, 18:36   #10 (permalink)
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Re: Seafoam in high mileage engines

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Cleaning, verifying adjustments/parameters.
Is there a place with some how to on this? Especially the verifying adjustments/parameters.
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