Has anyone done this with an older engine? Was it worth it?

I was thinking of trying it as i change the oil before i store the car for the winter so it would be good timing. But am worried about my almost 20 year old engine and it doing more damage than good.

 

i ran seafoam in my motor for around 200 miles after an oil changed and changed it again after the 200 miles... it was pretty obvious as to how dark the oil was that it did indeed clean up the motor. as for damage, so far no issues at all. i just wouldnt recommend keeping the seafoam in your crankcase much more than 200 miles

 

The risk would be that all the build up has to go somewhere and could clog things up. Higher mileage with lots of gunk are at higher risk. I live by the, if it broke, don't fix it rule.

 

I use seafoam in my Honda 400ex twice a year and normally change the oil at least 6 times a year
depending on how hard I have been riding it no problems works great !! helps keep the valve train
quite

 

Its the guy with 200,000 miles thats uses it for the first time, that I am worried about. Things like changing the oil and filter shortly after will help.

 

I've got about 140K on it now and i've never used it before so this is why i am a little reluctant to dump a bottle in.

 

I had 160k and ran it fine but I guess it's always a chance of being bad news. Up to you bro


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i used about 1/3 of a bottle and ran it for 150 miles....the oil was nasty...i then put in penzoil yellow bottle(for a good cheap cleaning oil) with a qt of marvel mystry oil. that oil i pulled out in 1500 miles and it looked new still. been running mobile one now for 300 miles and the oil still looks great. my car has 88k on it. i bought with around 85k and the oil was horrible looking.

 

What symptoms do you have that makes you consider using a product like this?

I personally would stay away from such products unless you have gunk in there. Pull a valve cover and take a look...if it isn't gummed up, don't bother.

Some of the flushes are solvents and solvents have a low lubricity. I'm thinking they could be worse for the bearings than not doing anything but regular oil changes. Marvel mystery oil and other automatic transmission fluid type products may work better but I'm not convinced they're good for the engine seals..

I do believe in using seafoam or GM top cylinder cleaner in the induction system, especially before a plug change. I'm not sure why but I'm assuming it's from the PCV system....