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Old 05-15-2013, 03:32 PM   #1
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Default Marvel Mystery Oil

I've used Marvel Mystery Oil for 30 years in various engines with good results. Detroit Diesel says no additives but I know many others who swear by this stuff and run it in their prevosts and bus conversions.
Has anyone used the product, and if so what are the results.



Franco Filipovic

2001 Newell Coach

Detroit Series 60 HP 500

Allison 6 Speed HD4060
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Old 05-15-2013, 03:46 PM   #2
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I always add MMO at every oil change,along with 1 bottle of STP with no problems.


1983 Newell Coach
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Old 05-15-2013, 04:50 PM   #3
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I have a good friend who is an OTR owner operator. He has been using Marvel Mystery Oil for over 20 years & swears by it.

If Ain't a Newell, It Ain't Wurt Oonin!
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Old 05-16-2013, 12:37 AM   #4
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The perspective I'm always interested in is what the major trucking companies are doing with their trucks. If Marvel Mystery Oil is making an improvement that exceeds its costs I assume the trucking companies would mandate its use as standard for their operations. Since the makers of MMO would find it very advantageous to have major trucking companies on board and since I've not heard a peep about that I'm guessing no major trucking company is regularly using it. If I am wrong I certainly would like to be corrected so I can start using the stuff and saving myself some money.

Everything I know just ain't so
Jon and Alie Kabbe
Started with 77 Coach
Now have 39' 93 coach
2007 civic toad
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Old 05-16-2013, 05:10 PM   #5
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How much MMO do you add to the crankcase on oil changes and is it really worth the added expense?
1978 39 FT. Newell Classic

Jeff & Leann Shackly
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