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Seafoam Motor Treatment Vs. Stp Motor Treatment Vs. Marvel Mystery Oil


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#1 VintageIronCollector OFFLINE  

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Posted March 02, 2014 - 05:48 PM

Which one has the best bang for your buck?


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#2 grnspot110 ONLINE  

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Posted March 02, 2014 - 06:14 PM

I use Seafoam & Marvel Mystery Oil in all my stored gas for the small engines.  Has worked well for me for several years, including engines that set un-started all winter.  ~~  Lowell


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#3 HDWildBill ONLINE  

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Posted March 02, 2014 - 06:29 PM

I prefer Seafoam, Every time I fill my gas can 5 oz's go in.  I used STP years ago but didn't see the same results.


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#4 A.C.T. OFFLINE  

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Posted March 02, 2014 - 06:34 PM

I also prefer Seafoam. Have used it for years with good results. 


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#5 Arti ONLINE  

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Posted March 02, 2014 - 07:38 PM

I put Seafoam in the first tank of fuel for the season then a capful of Marvel Mystery oil when filling the tank for the rest of the year.
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#6 trowel OFFLINE  

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Posted March 02, 2014 - 09:05 PM

Seafoam.



#7 superaben OFFLINE  

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Posted March 02, 2014 - 09:13 PM

I like Seafoam, always have for no good reason beyond knowing it works wonders.  I've never used STP.  Marvel Mystery Oil is good stuff, too, from what I hear, but I stick with what I know works.

 

Ben W.


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#8 MH81 ONLINE  

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Posted March 02, 2014 - 10:32 PM

Seafoam or a home brew, sometimes MMO, I do mix it up a bit. I like to give engines that haven't run in a while a little 2 cycle too.

#9 Utah Smitty OFFLINE  

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Posted March 02, 2014 - 11:18 PM

I used to Restore for stored engines, but discovered Seafoam about a year and a half ago.  It works great!  Also, the Seafoam treatment where you pour a little into the carb opening of a running engine until it stalls out, wait 10-30 minutes, then restart does wonders for engines that are hard to start, or run erratically, etc.  Also heard it helps de-carbonize the combustion chamber though I haven't verified this on my engines.

 

Be aware, however, that when you restart the engine it will put out a dense cloud of white smoke that is very persistent... warn your neighbors or the fire department may show up at your place!!

 

Smitty


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#10 boyscout862 ONLINE  

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Posted March 03, 2014 - 06:57 AM

I've used MMO since 1967. I use it in the fuel(1/2 oz per gallon) and sometimes poured down the carb. It cleans the combustion chamber and rings, prevents corrosion of the fuel system and combustion chamber, and reduces oil consumption while increasing compression.  Years ago, I used STP in the crankcase oil and when assembling bearings but, now oils are good enough to not need it. I have never even seen SeaFoam. When Benny's puts MMO on sale I buy a case. I especially use it in my old cars. Good Luck, Rick



#11 Oldford OFFLINE  

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Posted March 03, 2014 - 07:31 AM

Previously used seafoam til saw bad internal pics from good source.  Switched to MM no problems.  Doubles as lube in spray bottle/air tools/etc.  Also marine stabil for water/long sit, good luck so far.  STP did nothing for me.



#12 VintageIronCollector OFFLINE  

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Posted March 03, 2014 - 09:14 AM

How about Ethanol Shield? Same results as seafoam?



#13 JD DANNELS OFFLINE  

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Posted March 03, 2014 - 12:11 PM

Count me in on the MMO, always keep it on hand. My son likes Seafoam for his outboards but I have never used it.






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