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07-15-2011, 02:22 AM
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#1
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Senior Member
Winnebago Owners Club Workhorse Chassis Owner
Join Date: May 2010
Location: Eyota MN
Posts: 138
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Marvel's Mystery Oil
I was talking with a friend the other day who is a die hard user of MMO and suggested I use it in my motorhome in both the gas and oil. I've been using it in my lawnmower but not so sure about the motorhome. I've got Mobil 1 in the crankcase and am not sure if it needs anything more. What about you guys? Any opinions for or against the stuff?
Thanks,
Rod
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2004 Adventurer W-22 8.1 35u Banks power pack, Brazel ultra trac rear trac bar, Koni fsd, Blue Ox Alpha towing '06 HHR 
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07-15-2011, 02:49 AM
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#2
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Senior Member
Appalachian Campers
Join Date: Jan 2007
Location: Sewanee, Tennessee
Posts: 713
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Snake oil, although many older folks swear by it.
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SSgt. Richard L Ray, USAF (Retired) - Laura L Ray
Our second home is a vintage 1995 Jayco Eagle 277RB 'The Love Shack"
towed by a 2008 Ford F-250 Lariat Crew Cab short bed "The Green Goblin"
[SIGPIC][/SIGPIC]
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07-15-2011, 03:11 AM
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#3
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Senior Member
Thor Owners Club Ford Super Duty Owner
Join Date: Aug 2010
Posts: 860
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An engineer friend who was asked to test the ethanol in gas for boats and small engines said MMO is a good use in any engine. I have been using it since then. Add as directed on label.
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Mike, Janet & Duchess (cavalier King Charles)
2008 35B windsport, Brazel's rear TracBar, Koni shocks & Safe T plus steering
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07-15-2011, 04:42 AM
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#4
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Administrator in Memoriam
Newmar Owners Club Retired Fire Service RVer's Spartan Chassis
Join Date: May 2000
Location: Newark, DE
Posts: 25,898
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It's left over from the old Snake Oil days.
Modern engines don't need this sort of stuff in the oil or gas.
Most additives work very well at one thing.............separating your money from you.
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Adios, Dirk - '84 Real Lite Truck Camper, '86 Wilderness Cimarron TT, previously 4 years as a fulltimer in a '07 DSDP
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07-15-2011, 04:50 AM
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#5
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Senior Member
Join Date: Jul 2010
Posts: 5,337
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You're not going to do any better than Mobil1. Change oil and filter according to your manual and usage.
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Tom
2016 Newmar Bay Star Sport 3004
2021 Jeep Gladiator Sport Willys
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07-15-2011, 06:08 AM
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#6
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Senior Member
Monaco Owners Club
Join Date: Aug 2008
Location: Gretna Ne
Posts: 487
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Route 66 is correct, Modern engines don't need this sort of stuff in the oil or gas.
I have had some experience with older engines that did, depending on fuel quality, I have had stuck valves a few times, a little MMO in the gas did the job. 
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2001 Monaco Diplomat 8.3 40ft, 1999 Jeep Cherokee
IA summers, Parker Dam CA winters.
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07-15-2011, 06:41 AM
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#7
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Senior Member
Fleetwood Owners Club Workhorse Chassis Owner
Join Date: Oct 2009
Location: Lakemurray,SC
Posts: 1,308
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Mobil 1, enough said!
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2004 Pace Arrow 37-C WH W-22 (sold)
2012 Jeep Wrangler Sahara toad or
2005 Harley/Lehman trike/Featherlite trailer
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07-15-2011, 09:17 AM
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#8
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Senior Member
Join Date: Jul 2009
Posts: 466
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Quote:
Originally Posted by wildtoad
You're not going to do any better than Mobil1. Change oil and filter according to your manual and usage.
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You are not going to do worse without it either. 
Jim E
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07-15-2011, 11:55 AM
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#9
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Senior Member
Fleetwood Owners Club American Coach Owners Club
Join Date: Mar 2011
Posts: 6,768
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The only mystery about Mystery Oil is why anybody uses it.
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2014 American Eagle 45T
DD 13, 500 HP
Pulling a Honda CRV
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07-15-2011, 02:57 PM
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#10
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Senior Member
iRV2 No Limits Club
Join Date: May 2011
Location: Tempe, AZ
Posts: 1,833
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Marvel Mystery Oil is a solvent. It will dilute your oil, making it less effective. As other have said, modern fuels and lubes have additives that are far better than anything MMO could possibly offer. Using MMO could void an engine or cat convertor warranty.
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07-15-2011, 04:02 PM
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#11
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Senior Member
Damon Owners Club Workhorse Chassis Owner
Join Date: Mar 2009
Posts: 24,024
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As to why people use it... Well.... Ask P.T. Barnum: "There's a sucker born every minute" P.T. Barnum.
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Home is where I park it!
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07-15-2011, 04:10 PM
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#12
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Senior Member
Thor Owners Club Ford Super Duty Owner
Join Date: Aug 2010
Posts: 860
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We put in the gas not the oil as my friend suggested. Ethanol is not in the oil, MMO is to help fix what ethanol could damage.
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Mike, Janet & Duchess (cavalier King Charles)
2008 35B windsport, Brazel's rear TracBar, Koni shocks & Safe T plus steering
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07-15-2011, 04:25 PM
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#13
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Senior Member
Monaco Owners Club
Join Date: Apr 2009
Location: haliburton ontario canada
Posts: 234
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MMO is just kerosene, it is cleaning fluid.
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07-16-2011, 06:40 AM
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#14
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Senior Member
Join Date: Jul 2000
Posts: 4,034
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A really good product to keep your air impact wrench lubricated. Useless in any engine!!
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Moisheh
2008 Dynasty 42' Diamond IV
1988 Bluebird PT38
2009 Silverado Toad
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