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#3387762 - 06/03/14 10:48 AM Scotty Kilmer: Don't use MMO!
MileHigh18 Offline


Registered: 09/11/13
Posts: 180
Loc: TN
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?
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#3387765 - 06/03/14 10:52 AM Re: Scotty Kilmer: Don't use MMO! [Re: MileHigh18]
DB_Cooper Offline


Registered: 10/01/07
Posts: 368
Loc: Ga
No

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


Registered: 10/11/02
Posts: 21690
Loc: Colorado Springs
Huh?

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#3387770 - 06/03/14 10:55 AM Re: Scotty Kilmer: Don't use MMO! [Re: MileHigh18]
Realtech214 Offline


Registered: 02/01/13
Posts: 688
Loc: Florida
They cant put anything on the internet that isn't true
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#3387774 - 06/03/14 10:59 AM Re: Scotty Kilmer: Don't use MMO! [Re: MileHigh18]
Donald Offline


Registered: 03/21/04
Posts: 18036
Loc: Upstate NY
Unsure if it will ruin the cat, but its snake oil for sure!
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#3387777 - 06/03/14 11:02 AM Re: Scotty Kilmer: Don't use MMO! [Re: MileHigh18]
Sayjac Offline


Registered: 10/13/08
Posts: 10901
Loc: The Old North State
coffee->> popcorn-->> popcorn2--> Beer2

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#3387782 - 06/03/14 11:10 AM Re: Scotty Kilmer: Don't use MMO! [Re: MileHigh18]
Trav Offline


Registered: 11/20/06
Posts: 15134
Loc: MA, Mittelfranken.de
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.
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#3387784 - 06/03/14 11:12 AM Re: Scotty Kilmer: Don't use MMO! [Re: MileHigh18]
cwatkin Offline


Registered: 12/04/12
Posts: 31
Loc: MO
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.

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#3387786 - 06/03/14 11:14 AM Re: Scotty Kilmer: Don't use MMO! [Re: MileHigh18]
440Magnum Offline


Registered: 02/01/09
Posts: 8508
Loc: Texas
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.
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#3387794 - 06/03/14 11:23 AM Re: Scotty Kilmer: Don't use MMO! [Re: MileHigh18]
exranger06 Offline


Registered: 01/25/08
Posts: 3494
Loc: Guilford, CT
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
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#3387808 - 06/03/14 11:41 AM Re: Scotty Kilmer: Don't use MMO! [Re: MileHigh18]
zzyzzx Offline


Registered: 05/18/12
Posts: 3755
Loc: Baltimore, Maryland, USA
What's MMO?

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#3387814 - 06/03/14 11:45 AM Re: Scotty Kilmer: Don't use MMO! [Re: zzyzzx]
exranger06 Offline


Registered: 01/25/08
Posts: 3494
Loc: Guilford, CT
Originally Posted By: zzyzzx
What's MMO?

Marvel Mystery Oil
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#3387817 - 06/03/14 11:49 AM Re: Scotty Kilmer: Don't use MMO! [Re: exranger06]
01_celica_gt Offline


Registered: 07/29/13
Posts: 1764
Loc: St. Louis, MO
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...


Edited by 01_celica_gt (06/03/14 11:49 AM)
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#3387826 - 06/03/14 12:04 PM Re: Scotty Kilmer: Don't use MMO! [Re: MileHigh18]
RobertISaar Offline


Registered: 08/21/12
Posts: 144
Loc: Camden, MI, USA
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.

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#3387843 - 06/03/14 12:22 PM Re: Scotty Kilmer: Don't use MMO! [Re: RobertISaar]
Miller88 Offline


Registered: 04/09/08
Posts: 11801
Loc: Onondaga County
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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