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Scotty Kilmer: Don't use MMO! #3387762 06/03/14 10:48 AM
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MileHigh18 Offline OP
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I usually watch Scotty Kilmer on YouTube, and noticed he commented that you shouldn't use MMO in a modern car because it ruins the catalytic converter. Is there any truth to this?


2002 Trailblazer LT 119K
Pennzoil Platinum 5-30
Re: Scotty Kilmer: Don't use MMO! [Re: MileHigh18] #3387765 06/03/14 10:52 AM
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DB_Cooper Offline
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No

Re: Scotty Kilmer: Don't use MMO! [Re: MileHigh18] #3387768 06/03/14 10:54 AM
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Drew99GT Offline
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Huh?

Re: Scotty Kilmer: Don't use MMO! [Re: MileHigh18] #3387770 06/03/14 10:55 AM
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Realtech214 Offline
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They cant put anything on the internet that isn't true


2015 Silverado Crew Cab 5.3 LT 120,xxx miles
2001 Suburban LT 145,xxx miles
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Re: Scotty Kilmer: Don't use MMO! [Re: MileHigh18] #3387774 06/03/14 10:59 AM
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Donald Offline
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Unsure if it will ruin the cat, but its snake oil for sure!


2015 Subaru Forester 2.5 engine/CVT
2015 Ford F250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)
Re: Scotty Kilmer: Don't use MMO! [Re: MileHigh18] #3387777 06/03/14 11:02 AM
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Sayjac Offline
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coffee->> popcorn-->> popcorn2--> Beer2

Re: Scotty Kilmer: Don't use MMO! [Re: MileHigh18] #3387782 06/03/14 11:10 AM
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Trav Offline
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Originally Posted By: MileHigh18
I usually watch Scotty Kilmer on YouTube, and noticed he commented that you shouldn't use MMO in a modern car because it ruins the catalytic converter. Is there any truth to this?

Frank (Demarpaint) has been using this stuff for years and AFAIK hasn't put a cat in anything yet.
Lets not turn this into a snake or or not thread, that always goes downhill fast.
The answer to your question is no it wont ruin the cat when used as directed.


ASE L1, Master. Deutsch Meisterbrief.
Re: Scotty Kilmer: Don't use MMO! [Re: MileHigh18] #3387784 06/03/14 11:12 AM
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cwatkin Offline
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I understand that all MMO is really just a diesel or kerosene type product which serves as a good cleaner in engines and fuel systems.

I know several mechanics that will only use this product when flushing out a sludgy engine. Sure, they say that Seafoam and other similar products are better at dissolving sludge. They work too well and break off large pieces all at once where they can clog critical oil passages or get into bearing surfaces and ruin them. MMO is a gentle flush so don't expect it to clean the engine out in one flush. It takes time. Basically you want the sludge out of the engine but getting it out all at once can do more harm than just leaving it be.

Re: Scotty Kilmer: Don't use MMO! [Re: MileHigh18] #3387786 06/03/14 11:14 AM
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440Magnum Offline
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If you use it in the oil- no problem. If you put it in fuel, it does a number of questionable things, such as put a heavier unburned HC load on the catalyst, CAUSE carbon build-up on exhaust valves, lower effective octane, etc. AFAIK, it doesn't have anything that will outright poison a catalyst (tetraethyllead, methyl manganese tricarbonyl, other metallic compounds), but the added HC load doesn't help it.


'66 Dodge Polara & '69 Dodge Coronet R/T both 440/727
'08 Ram 1500 4.7/545RFE
'12 Challenger SRT8 392/6-speed
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Re: Scotty Kilmer: Don't use MMO! [Re: MileHigh18] #3387794 06/03/14 11:23 AM
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exranger06 Online Confused
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Scotty Kilmer lost a lot of respect from me when he made a video about fixing brake lines and he used a compression fitting. He has also mentioned that he like Lucas products... crush


2006 Ford Ranger Sport
1992 Honda Accord EX
2013 Toyota Sienna XLE AWD
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2011 Cadillac Escalade ESV (wife's)
Re: Scotty Kilmer: Don't use MMO! [Re: MileHigh18] #3387808 06/03/14 11:41 AM
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zzyzzx Offline
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What's MMO?

Re: Scotty Kilmer: Don't use MMO! [Re: zzyzzx] #3387814 06/03/14 11:45 AM
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exranger06 Online Confused
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Originally Posted By: zzyzzx
What's MMO?

Marvel Mystery Oil


2006 Ford Ranger Sport
1992 Honda Accord EX
2013 Toyota Sienna XLE AWD
1994 Ford Bronco XLT (project)
2011 Cadillac Escalade ESV (wife's)
Re: Scotty Kilmer: Don't use MMO! [Re: exranger06] #3387817 06/03/14 11:49 AM
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01_celica_gt Offline
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Originally Posted By: exranger06
Originally Posted By: zzyzzx
What's MMO?

Marvel Mystery Oil

dang i just watched the new xmen, they really are everywhere...

Last edited by 01_celica_gt; 06/03/14 11:49 AM.

Red 01 Celica GT 1ZZ-FED(Rebuilt @ 211) @ 230k
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Re: Scotty Kilmer: Don't use MMO! [Re: MileHigh18] #3387826 06/03/14 12:04 PM
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RobertISaar Offline
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kilmer also recommend dumping in a gallon of acetone(i think) into the fuel to "fix" cat efficiency codes, rather than fixing the actual issue.

Re: Scotty Kilmer: Don't use MMO! [Re: RobertISaar] #3387843 06/03/14 12:22 PM
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Miller88 Offline
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Originally Posted By: RobertISaar
kilmer also recommend dumping in a gallon of acetone(i think) into the fuel to "fix" cat efficiency codes, rather than fixing the actual issue.


That one has been around forever. Along with dumping straight alcohol into the tank of something that can't pass a sniff test.


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