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04-13-2011, 04:39 PM
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#1
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Junior Member
Join Date: Jul 2005
Posts: 27
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Is mobile 1 gear oil safe to add to rear differential if it is low?
The oil in my rear axle differential is low and I need to add some oil. Is it safe just to use mobil 1 75W-90 syntehetic gear oil to bring it back to the correct level?
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04-13-2011, 04:47 PM
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#2
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Senior Member
National RV Owners Club
Join Date: Jul 2009
Posts: 232
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Mobil claims to be compatible with other oils. I for one would be comfortable with toping off that gear oil. However, this thread has the word oil in it. I am sure others will also throw in some opinions.
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04-13-2011, 04:56 PM
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#3
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Senior Member
Mid Atlantic Campers Ford Super Duty Owner
Join Date: Sep 2010
Location: NE PA
Posts: 154
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I would and I have in the past without any neg results
__________________
Doug and Lisa, FMCA 436113
2006 Fleetwood Providence 39L
350 HP Cat, Spartan, 24' ATC enclosed
Subaru Outback, Cricket SW3
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04-13-2011, 07:15 PM
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#4
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Moderator Emeritus
Winnebago Owners Club Workhorse Chassis Owner Coastal Campers Carolina Campers
Join Date: Jan 2000
Location: Conway, SC
Posts: 23,641
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Quote:
Originally Posted by usaret
The oil in my rear axle differential is low and I need to add some oil. Is it safe just to use Mobil 1 75W-90 synthetic gear oil to bring it back to the correct level?
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Yes. With the vehicle on a level surface, fill the differential until the fluid begins to wet the threads in the fill hole. 
__________________
03 Adventurer 38G, Workhorse W22
F&R Track Bars, Safety+ , Ultrapower, Taylor Extremes, SGII
TST 507, Blue Ox, SMI, Koni FSD, CrossFire
RV/MH Hall of Fame - Lifetime Member
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04-13-2011, 08:07 PM
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#5
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Senior Member
Workhorse Chassis Owner
Join Date: Jun 2006
Location: Northwestern Montana
Posts: 3,513
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Why is your rear end low on lubricant?
Dieselclacker
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04-13-2011, 09:03 PM
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#6
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Junior Member
Join Date: Jul 2005
Posts: 27
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Its looks like I have a seal leak because there is oil on my rear tire. I have to take it in for service and want to make sure that the level is correct before making the 20 mile trip.
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04-14-2011, 08:43 AM
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#7
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Moderator Emeritus
Winnebago Owners Club Workhorse Chassis Owner Coastal Campers Carolina Campers
Join Date: Jan 2000
Location: Conway, SC
Posts: 23,641
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Quote:
Originally Posted by usaret
Its looks like I have a seal leak because there is oil on my rear tire. I have to take it in for service and want to make sure that the level is correct before making the 20 mile trip.
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OK ... Is it leaking on the inside or the outside from the hub?
__________________
03 Adventurer 38G, Workhorse W22
F&R Track Bars, Safety+ , Ultrapower, Taylor Extremes, SGII
TST 507, Blue Ox, SMI, Koni FSD, CrossFire
RV/MH Hall of Fame - Lifetime Member
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04-14-2011, 11:19 AM
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#8
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Junior Member
Join Date: Jul 2005
Posts: 27
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It is located on the inside. I looked underneath and saw some oil dripping down the real left inside dually and saw that the brake rotor was a little wet also.
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04-14-2011, 02:38 PM
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#9
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Moderator Emeritus
Winnebago Owners Club Workhorse Chassis Owner Coastal Campers Carolina Campers
Join Date: Jan 2000
Location: Conway, SC
Posts: 23,641
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Quote:
Originally Posted by usaret
It is located on the inside. I looked underneath and saw some oil dripping down the real left inside dually and saw that the brake rotor was a little wet also.
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OK that's your inside seal. I thought we could have done an easy fix there but no joy! Gotta pull the wheel. 
__________________
03 Adventurer 38G, Workhorse W22
F&R Track Bars, Safety+ , Ultrapower, Taylor Extremes, SGII
TST 507, Blue Ox, SMI, Koni FSD, CrossFire
RV/MH Hall of Fame - Lifetime Member
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04-14-2011, 03:09 PM
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#10
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Senior Member
Ford Super Duty Owner
Join Date: Jan 2011
Location: Kitts Hill, OH
Posts: 2,252
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Quote:
Originally Posted by dieselclacker
Why is your rear end low on lubricant?
Dieselclacker
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X2 you beat me to that one.
__________________
(RVM#26) THE U-RV 94 F-700/24 foot U-haul box home built RV
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