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10-27-2015, 07:16 PM
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#1
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Senior Member
Join Date: Apr 2014
Posts: 150
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oil viscosity
have 2010 8.1 L GM motor and wonder whether to use 10W30 or 5W30 Mobil 1.
Live in IL. but hardly ever drive in weather below zero. Motor Home is garaged
Take to FLA 3 months in winter. Thanks
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10-27-2015, 07:42 PM
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#2
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Community Moderator
Join Date: Aug 2011
Posts: 6,201
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I think either one would be fine.
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10-27-2015, 07:47 PM
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#3
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Senior Member
Tiffin Owners Club
Join Date: Mar 2015
Location: Southern NM
Posts: 2,514
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is there an operator manual? A lot of times it will have the type of oil imprinted on the oil filler cap
__________________
2005 Tiffin Allegro Bay 37DB
W22 Workhorse Chassis 8.1 Flat Towing a 82 Jeep CJ7
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10-27-2015, 09:36 PM
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#4
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Senior Member
Official iRV2 Sponsor
Join Date: Jun 2008
Location: Centralia, WA
Posts: 1,216
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5W30 is what is recommended.
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10-28-2015, 12:12 AM
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#5
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Senior Member
Monaco Owners Club Workhorse Chassis Owner
Join Date: Aug 2002
Location: Clovis, CA, USA
Posts: 13,154
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As Ultra RV Tech said....5W30 is what the manual suggests.
I run 10W30 Mobile 1 Extended in the summer...100 degree weather here most of the summer.
5W30 Mobile 1 Extended in the winter although it seldom gets below freezing here.
__________________
2004 Monaco La Palma 36DBD, W22, 8.1, 7.1 MPG
2000 LEXUS RX300 FWD 22MPG 4020 LBS
Criticism is easier than Craftsmanship
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10-28-2015, 07:24 AM
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#6
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Senior Member
Join Date: Oct 2015
Location: Brighton, MI
Posts: 775
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Quote:
Originally Posted by Ultra RV Tech
5W30 is what is recommended.
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Yup, and I go with what GM recommends for the engine.
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10-28-2015, 08:07 AM
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#7
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Senior Member
Workhorse Chassis Owner
Join Date: Jun 2006
Location: Northwestern Montana
Posts: 3,514
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Depends on the outside temperatures where you will be operating the motorhome. From the temps you stated, I would prefer 10W/30 for the Mobil 1 you have chosen to use.
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Dieselclacker
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10-28-2015, 11:45 AM
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#8
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Senior Member
Join Date: Nov 2013
Posts: 5,782
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If using Mobil-1, I prefer the high mileage version because it is higher in the 30W viscosity range at 100 degrees C.
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2015 Tiffin Phaeton 40QBH
2018 Chevrolet Colorado Toad
Roadmaster Tow Setup
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10-28-2015, 08:09 PM
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#9
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Senior Member
Workhorse Chassis Owner Rexhall Owners Group
Join Date: Feb 2003
Location: Everywhere,USA
Posts: 1,520
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With the tight tolerances in today's engines, use what the manufacturer recommends or you could be lacking lucubration in certain situations.
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Full-Timers
in a
2003 Rexhall Aerbus 3550BSL
W22 Workhorse
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10-28-2015, 08:16 PM
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#10
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Senior Member
Country Coach Owners Club Solo Rvers Club iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 37,725
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Quote:
Originally Posted by Full-Timers
With the tight tolerances in today's engines, use what the manufacturer recommends or you could be lacking lucubration in certain situations.
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Yep, running higher viscosity oils than the recommended can wipe a bearing. The tolerances in engines today just don't need it.
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2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
Charter Good Sam Lifetime Member, FMCA,
RV'ing since 1957, NRA Benefactor Life, towing '21 Jeep JLU Rubicon Ecodiesel
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10-28-2015, 08:44 PM
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#11
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Senior Member
Join Date: Jun 2012
Location: AB
Posts: 7,587
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Use whatever you think best. What would the guy who designed and built the engine know anyway.
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2019 Unity LTV CB, pushed by a 2013 Honda CRV, BlueOx Baseplate, Aventa Bar & Patriot Brake
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10-28-2015, 09:14 PM
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#12
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Community Moderator
Join Date: Aug 2011
Posts: 6,201
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Quote:
Originally Posted by dennis45
Use whatever you think best. What would the guy who designed and built the engine know anyway.
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The number before the W is the equivalent viscosity at 0 degrees C -- at engine operating temperature both oils have the same viscosity rating of 30.
The designer of the engine just specifies the oil with the widest temperature operating range..... If your climate never sees extreme cold, there is nothing wrong with using a 10W-30 vs a 5W-30
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10-29-2015, 06:01 AM
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#13
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Senior Member
Join Date: Oct 2015
Location: Brighton, MI
Posts: 775
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Yes 10W-30 is okay if you don't see extreme cold temps. How cold will it be when he leaves Il this winter for Fl? Hard to say. Same for me when I leave Mi for Fl, I don't know what the temps will be. Since 5W-30 has me covered no matter what the temp it just makes sense to run it all the time.
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10-29-2015, 07:48 AM
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#14
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Senior Member
Join Date: Feb 2003
Location: Jarrell, TX 76537
Posts: 4,501
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I have been running 10w30 for 11 years here in Texas. No issues.
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AKA - Oemy
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