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#3410715 - 06/30/14 09:32 AM MMO in crankcase - how many miles?
dan765 Offline


Registered: 06/17/14
Posts: 53
Loc: Utah
Gents,

I threw a quart of MMO in my crankcase a couple days ago (My car holds 4.5 quarts of oil). In your opinion, would it be ok to keep it in there for about 1,000 miles, or would that be pushing it?

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#3410717 - 06/30/14 09:34 AM Re: MMO in crankcase - how many miles? [Re: dan765]
Phishin Offline


Registered: 05/01/12
Posts: 2223
Loc: Indiana
I have found no ill effects in running MMO the entire length of an OCI.
_________________________
2010 Accord-LX K24: PU 5w30
2014 CR-V LX K24: TBD
1990 Chevy K1500 350TBI: Frankenbrew
2008 Ruckus 50ccGET: M1R Mix

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#3410740 - 06/30/14 10:02 AM Re: MMO in crankcase - how many miles? [Re: dan765]
Cujet Offline


Registered: 02/15/03
Posts: 6058
Loc: Jupiter, Florida
I'm not a fan of using MMO for extended periods of time. It simply dilutes the excellent engineering and additive packages that comprise modern oils.

Put another way, use it to clean, drain it out and use a quality oil, without adding anything.
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#3410745 - 06/30/14 10:09 AM Re: MMO in crankcase - how many miles? [Re: Cujet]
dan765 Offline


Registered: 06/17/14
Posts: 53
Loc: Utah
Originally Posted By: Cujet
I'm not a fan of using MMO for extended periods of time. It simply dilutes the excellent engineering and additive packages that comprise modern oils.

Put another way, use it to clean, drain it out and use a quality oil, without adding anything.

What's your definition of 'extended period of time'? Please note that I'm not talking about time periods, but am talking about mileage.
I'm going to do some traveling for the July 4th holiday and estimate that I will put about 800 miles on the car by next Monday. I put the MMO in about 20 miles ago.
So my question is would 1,000 miles be too many to have MMO in the crankcase?


Edited by dan765 (06/30/14 10:10 AM)

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#3410764 - 06/30/14 10:33 AM Re: MMO in crankcase - how many miles? [Re: dan765]
Chevydriver Offline


Registered: 04/06/14
Posts: 2
Loc: Va
I typically go 7-8k OCI and add MMO the last 500-1000 as a cleaner.

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#3410795 - 06/30/14 11:06 AM Re: MMO in crankcase - how many miles? [Re: Phishin]
sw99 Offline


Registered: 03/22/06
Posts: 1886
Loc: Colorado
Originally Posted By: Phishin
I have found no ill effects in running MMO the entire length of an OCI.


+1
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#3411186 - 06/30/14 07:06 PM Re: MMO in crankcase - how many miles? [Re: dan765]
SirTanon Online   content


Registered: 06/23/14
Posts: 1392
Loc: Phoenix, Arizona - USA
At my last oil change, I went with 4.5 qts of oil and .5 quarts of MMO, instead of a full 5 quarts of oil. The bottle says to use a full quart, but I felt more comfortable with .5 qt.

That said, I also adjusted my oil mix a bit. The car calls for 5w-20, so I used 5w-30 for the last 1.5 qt of oil to offset the .5 qt of MMO, since it's quite a bit thinner.

That was about 1500 miles ago, and the car runs great.


Edited by SirTanon (06/30/14 07:06 PM)
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2010 Ford Fusion SE - 2.5 liter/6F35 Trans - 231,000mi
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#3411442 - 07/01/14 07:54 AM Re: MMO in crankcase - how many miles? [Re: dan765]
leroyd92 Offline


Registered: 01/21/14
Posts: 391
Loc: AZ
run it and dont worry about it. the traveling will do your car some good with it in there. if you feel frisky, pull a few oz of oil from the dipstick and save them in a little party cup, pull a few more in a different cupp when your home and see tye difference in color.

i did this with a boat motor and my old harley when i got it. works wonders...
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#3411572 - 07/01/14 10:39 AM Re: MMO in crankcase - how many miles? [Re: leroyd92]
niero Offline


Registered: 07/31/08
Posts: 111
Loc: MN, USA
Will it hurt anything to add about half a quart of MMO without draining .5 quart of oil? Will it be "too full" and cause damage if I run it for 500 miles?

(Hope this isn't considered hijacking the thread. Figured it was a very similar issue.)
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1997 Jeep Grand Cherokee Laredo Tsi
4.0 L inline 6 cyl
Currently running full synthetic 5w30

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#3411792 - 07/01/14 03:43 PM Re: MMO in crankcase - how many miles? [Re: dan765]
SirTanon Online   content


Registered: 06/23/14
Posts: 1392
Loc: Phoenix, Arizona - USA
A good rule of thumb is "never overfill your ____________"

..and fill in the blank with:

Crankcase
Transmission
Bathtub


If your dipstick reads full, then wait. If your dipstick is down by a 1/2 quart, then I don't see any harm in topping off with a 1/2 quart of MMO.
_________________________
2010 Ford Fusion SE - 2.5 liter/6F35 Trans - 231,000mi
2014 Nissan Altima SL - 2.5 liter/CVT - 40,000mi

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#3411926 - 07/01/14 07:12 PM Re: MMO in crankcase - how many miles? [Re: dan765]
Cujet Offline


Registered: 02/15/03
Posts: 6058
Loc: Jupiter, Florida
Originally Posted By: dan765

What's your definition of 'extended period of time'? Please note that I'm not talking about time periods, but am talking about mileage.


I certainly hope you know what I meant. But, since we are mincing words, I will re-phrase. I am not a fan of using Marvel Mystery Oil to dilute a quality motor oil, ever. If it's being used as a cleaning solvent and engine flush, just prior to an oil change, so be it. But I don't want ANY Marvel Mystery Oil in my crankcase during ANY normal operation.

I'm not predicting trouble by it's use. I am questioning why people feel it's necessary to add MMO to an otherwise very well engineered oil. Certainly, you can choose an oil that will clean deposits, such as any quality synthetic, if that's your goal. It will clean quite well without any need to change the chemistry of the product. MMO is almost 1/3 mineral spirits, has a very thin mineral oil base, Some phos with no zinc (not a good combo) , wintergreen scent and red dye. Not exactly a wonderful combination of confidence. In fact, it's a whole lot of nothing.



Edited by Cujet (07/01/14 07:13 PM)
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#3412230 - 07/02/14 05:32 AM Re: MMO in crankcase - how many miles? [Re: dan765]
Trajan Offline


Registered: 07/16/05
Posts: 3730
Loc: SE PA
I used it once. It didn't fix the problem that I first thought it did. It didn't hurt anything either during the short time I used it.
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Lack of harm is not proof of benefit.

There are in fact two things, science and opinion; the former begets knowledge, the later ignorance. Hippocrates





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#3412254 - 07/02/14 06:35 AM Re: MMO in crankcase - how many miles? [Re: dan765]
Cujet Offline


Registered: 02/15/03
Posts: 6058
Loc: Jupiter, Florida
I wonder if Blackstone can provide UOA results that show what happens with the use of MMO. I do remember someone on this site showing higher wear metals with the use of MMO. However, that was simply one data point.
_________________________
Turbo's rule.

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#3412305 - 07/02/14 08:01 AM Re: MMO in crankcase - how many miles? [Re: SirTanon]
niero Offline


Registered: 07/31/08
Posts: 111
Loc: MN, USA
Originally Posted By: SirTanon
A good rule of thumb is "never overfill your ____________"

..and fill in the blank with:

Crankcase
Transmission
Bathtub


If your dipstick reads full, then wait. If your dipstick is down by a 1/2 quart, then I don't see any harm in topping off with a 1/2 quart of MMO.


Awesome, thank you. Just what I needed to know!
_________________________
1997 Jeep Grand Cherokee Laredo Tsi
4.0 L inline 6 cyl
Currently running full synthetic 5w30

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#3412377 - 07/02/14 09:34 AM Re: MMO in crankcase - how many miles? [Re: Cujet]
Garak Offline


Registered: 12/05/09
Posts: 21087
Loc: Regina, Saskatchewan, Canada
Originally Posted By: Cujet
But I don't want ANY Marvel Mystery Oil in my crankcase during ANY normal operation.

I normally don't step into these MMO threads, but I think we need to look at the history about. MMO has been around for just about forever. I could understand the desire for crankcase additives (and flushes) in the days of non-detergent motor oils, such as when this product first came out. For a vehicle running appropriate OCIs with a modern, certified motor oil, I'm skeptical.
_________________________
Plain, simple Garak.

2008 Infiniti G37 coupe - Mobil Delvac 1 ESP 5w-40, Baldwin B1402
1984 F-150 4.9L six - Quaker State GB 10w-30, Wix 51515

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