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07-15-2011, 02:22 AM
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#1
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Senior Member
Workhorse Chassis Owner Winnebago Owners Club
Join Date: May 2010
Location: Eyota MN
Posts: 121
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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 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: Home based in Marion County, Tennessee
Posts: 640
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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 home is a 1995 Jayco Eagle 277RB 'The Love Shack"
towed by a 2005 Ford F-250 Lariat Crew Cab "The Blue Beast"
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07-15-2011, 03:11 AM
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#3
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Senior Member
Ford Super Duty Owner Thor Owners Club
Join Date: Aug 2010
Posts: 829
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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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Community Administrator
Newmar Owners Club
Join Date: May 2000
Location: Newark, DE
Posts: 13,896
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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, '07 DSDP, '11 Virtual RV
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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: 651
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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 Wilds
Blythewood SC
2000 Four Winds Hurricane 30Q
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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
Posts: 226
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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 Diplomat 8.3 40ft
IA summers, Lake Havasu AZ winters
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07-15-2011, 06:41 AM
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#7
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Senior Member
Workhorse Chassis Owner Fleetwood Owners Club
Join Date: Oct 2009
Location: Lakemurray,SC
Posts: 705
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Mobil 1, enough said!
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Sunny South Carolina
2004 Pace Arrow 37-C WH W-22
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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: 443
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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
Join Date: Mar 2011
Posts: 1,393
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The only mystery about Mystery Oil is why anybody uses it.
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2009 Amer Coach Allegiance 40X With Spartan Chassis
400 HP Cummins ISL
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
Join Date: May 2011
Location: Tempe, AZ
Posts: 1,186
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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
Workhorse Chassis Owner Damon Owners Club
Join Date: Mar 2009
Posts: 8,085
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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
Ford Super Duty Owner Thor Owners Club
Join Date: Aug 2010
Posts: 829
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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: 202
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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: 1,261
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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
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