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02-10-2020, 11:44 AM
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#1
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Senior Member
Join Date: Mar 2019
Location: Braidwood Il.
Posts: 8,300
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5-40w synthetic in diesel generator
Off the top of my head my genny calls for 5-30 cold -10-30w large range middle temp range- 15-40 in high temps 90+.
Since we should start genny in the winter it seems like a good option. When my genny was made there wasn't 5-40 or other wide range multi grades available to list as an option.
I guess most of the real run time is for AC I have heating grids in them but an Aquahot so unless plugged , I just run grids as amp draw for genny when it's cold.
Sams has the T6 5-40w on sale.
Actually the truck oils are on sale more than anything else there.
__________________
95 Monaco Crown Royale
M11 400hp, 4060 trans.
Aquahot, Generac Guardian7.5k
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02-10-2020, 12:41 PM
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#2
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Senior Member
Fleetwood Owners Club American Coach Owners Club
Join Date: Mar 2011
Posts: 6,768
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I have a diesel generator, so I use the same oil in it that goes in the coach. Shell Rotella 15W40.
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2014 American Eagle 45T
DD 13, 500 HP
Pulling a Honda CRV
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02-11-2020, 08:00 AM
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#3
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Senior Member
Join Date: Jan 2018
Location: Sacramento CA.
Posts: 536
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Quote:
Originally Posted by Cat320
I have a diesel generator, so I use the same oil in it that goes in the coach. Shell Rotella 15W40.
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I do yhe same except i use delo 15W40
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2005 Itasca meridian
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02-11-2020, 08:29 AM
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#4
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Registered User
Monaco Owners Club
Join Date: Mar 2018
Location: Blairsville, GA & WPB, FL
Posts: 3,993
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Not going to hurt anything other than your wallet. I do not worry about exercising my generator every month. RV generators are the only ones that are delicate.
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02-11-2020, 09:13 AM
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#5
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Moderator Emeritus
Join Date: Jan 2000
Location: West Palm Beach, FL. USA
Posts: 27,713
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There is no reason not to use it, if that's what you want.
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Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
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02-13-2020, 07:22 AM
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#6
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Senior Member
Tiffin Owners Club Spartan Chassis
Join Date: Mar 2019
Location: Fulltime - Plan to retire in Crystal River, FL
Posts: 391
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Quote:
Originally Posted by 153stars
Off the top of my head my genny calls for 5-30 cold -10-30w large range middle temp range- 15-40 in high temps 90+.
Since we should start genny in the winter it seems like a good option. When my genny was made there wasn't 5-40 or other wide range multi grades available to list as an option.
I guess most of the real run time is for AC I have heating grids in them but an Aquahot so unless plugged , I just run grids as amp draw for genny when it's cold.
Sams has the T6 5-40w on sale.
Actually the truck oils are on sale more than anything else there.
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That's a good choice...especially if you are seeing any cold weather.
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Nick & Peggy (US Navy, Retired) Full Time
2008 Tiffin Allegro Bus 42QRP Toad - 2016 Ford F150
AWOL - Adventures With the Old Lady
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02-13-2020, 07:42 AM
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#7
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Senior Member
Tiffin Owners Club
Join Date: Sep 2016
Location: Grand Rapids, MN
Posts: 181
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I use 5W-40 Rotella T6 full synthetic in both the coach and Onan generator. Coach starts good in the winter down to 15°. The Onan seems to like this oil also. As far as that goes, I just started using this oil in the 2.7L Mercedes diesel powered Jeep Grand Cherokee, imported back from Europe.
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2003 Allegro Bus 35'
330 hp, Cat 2136E
2012 Jeep JKU Rubicon
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04-17-2020, 01:56 PM
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#8
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Senior Member
Join Date: Feb 2000
Location: Chilliwack, BC Canada
Posts: 526
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I use 15w40 (same as goes into my DP engine). No issues starting the genny in January here in Canada.
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Chris
1998 Beaver Patriot Monticello - 330 HP Cat "Ruby"
TOAD: 2017 Ford SHO "Luna" 365 hp
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04-17-2020, 03:48 PM
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#9
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Senior Member
Join Date: Aug 2017
Posts: 2,106
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5-40 would work just fine in the generator. I've been running it in my standby diesel generator for years. In my motorhome, Onan gas genny I just run plain old dino 10-30. The generator never gets started in the fall and winter months.
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1993 Tiffin Allegro Bay 32'
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04-17-2020, 07:17 PM
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#10
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Senior Member
Join Date: Aug 2001
Location: North America somewhere
Posts: 30,982
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Quote:
Originally Posted by Cat320
I have a diesel generator, so I use the same oil in it that goes in the coach. Shell Rotella 15W40.
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That is the recommendation of Cummins/Onan.
__________________
2000 Winnebago Ultimate Freedom USQ40JD , ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA. " My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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