Journey with Confidence RV GPS App RV Trip Planner RV LIFE Campground Reviews RV Maintenance Take a Speed Test Free 7 Day Trial ×
RV Trip Planning Discussions

Go Back   iRV2 Forums > POWER TRAIN GARAGE FORUMS > Cummins Engines
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
 
Thread Tools Search this Thread Display Modes
 
Old 09-08-2022, 08:10 AM   #1
Senior Member
 
tmw188's Avatar


 
Monaco Owners Club
National RV Owners Club
Workhorse Chassis Owner
Join Date: Dec 2013
Location: St. Charles MO
Posts: 4,755
Send a message via AIM to tmw188
Differential Oil Change ISC 8.3

Is changing this fluid as straight forward as one might think? I know to make sure the fill plug can be removed for refilling before draining, any other suggestions?
__________________
2002 Monaco Windsor 40PST 2019 Equinox 1.5L, Blue OX Aventa LX tow bar, Roadmaster EZ5 baseplate, SMI Stay-In-Play Duo, TireSafeGuard TPMS
tmw188 is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 09-08-2022, 08:15 AM   #2
Senior Member
 
jacwjames's Avatar
 
Monaco Owners Club
Join Date: Jun 2014
Posts: 12,405
Yup, about as straight forward as on a car/truck. I just used a 5 gallon bucket to catch the old oil. Can't remember how much I used, just bought extra and took excess back.



I did mine at ~90K miles. If you don't have it here's a copy of the lubrication guide for your Roadmaster chassis.
Attached Files
File Type: pdf Roadmaster Lube_Guide_Complete.pdf (2.82 MB, 24 views)
__________________
Jim J
2002 Monaco Windsor 38 PKD Cummins ISC 350 8.3L
2005 Jeep Grand Cherokee w/5.7 Hemi
jacwjames is offline   Reply With Quote
Old 09-08-2022, 06:02 PM   #3
Senior Member
 
tmw188's Avatar


 
Monaco Owners Club
National RV Owners Club
Workhorse Chassis Owner
Join Date: Dec 2013
Location: St. Charles MO
Posts: 4,755
Send a message via AIM to tmw188
Differential Oil Change ISC 8.3

Thanks Jim, I donít have that publication- thank you. I donít have any records of that service being done. I have 71,000 I want to do it while Iím indoors on level concrete before I might loose my indoor storage🥲
__________________
2002 Monaco Windsor 40PST 2019 Equinox 1.5L, Blue OX Aventa LX tow bar, Roadmaster EZ5 baseplate, SMI Stay-In-Play Duo, TireSafeGuard TPMS
tmw188 is offline   Reply With Quote
Old 09-09-2022, 04:04 AM   #4
Senior Member
 
Holiday Rambler Owners Club
Join Date: Apr 2020
Location: Farmington Hills, Michigan
Posts: 648
I had mine done at Speedco (Love's) couple years ago, it was only $138.00 total.
Actually turned out to be cheaper than purchasing just the oil myself, Spirax S6 75W90SYN Gear oil.
__________________
2004 Holiday Rambler Imperial 40PKD, Cummins ISL 400
2019 Buick Envision AWD
Lowflyer1 is offline   Reply With Quote
Old 09-10-2022, 07:52 AM   #5
Senior Member
 
vettenuts's Avatar
 
Join Date: Nov 2013
Posts: 5,516
I did mine when I bought the coach because I had no maintenance records. There are a couple of differentials that are used and each has their own fluid specification. I used a synthetic to reduce maintenance requirements.
__________________
2015 Tiffin Phaeton 40QBH
2018 Chevrolet Colorado Toad
Roadmaster Tow Setup
vettenuts is offline   Reply With Quote
Old 09-10-2022, 07:54 AM   #6
Senior Member
 
vettenuts's Avatar
 
Join Date: Nov 2013
Posts: 5,516
Quote:
Originally Posted by jacwjames View Post
Yup, about as straight forward as on a car/truck. I just used a 5 gallon bucket to catch the old oil. Can't remember how much I used, just bought extra and took excess back.



I did mine at ~90K miles. If you don't have it here's a copy of the lubrication guide for your Roadmaster chassis.


Thatís a nice manual. The Freightliner manual I have isnít as explicit.
__________________
2015 Tiffin Phaeton 40QBH
2018 Chevrolet Colorado Toad
Roadmaster Tow Setup
vettenuts is offline   Reply With Quote
Old 10-02-2022, 09:26 AM   #7
Senior Member
 
tmw188's Avatar


 
Monaco Owners Club
National RV Owners Club
Workhorse Chassis Owner
Join Date: Dec 2013
Location: St. Charles MO
Posts: 4,755
Send a message via AIM to tmw188
How level left to right, Iím assuming reasonably level should be fine but donít like assuming? One end of the axle may hold more oil than the other although it is what it is. Whatís your opinion?
__________________
2002 Monaco Windsor 40PST 2019 Equinox 1.5L, Blue OX Aventa LX tow bar, Roadmaster EZ5 baseplate, SMI Stay-In-Play Duo, TireSafeGuard TPMS
tmw188 is offline   Reply With Quote
Old 10-02-2022, 01:21 PM   #8
Senior Member
 
mackwrench's Avatar
 
American Coach Owners Club
Join Date: Apr 2016
Location: North Florida
Posts: 2,308
Quote:
Originally Posted by tmw188 View Post
How level left to right, Iím assuming reasonably level should be fine but donít like assuming? One end of the axle may hold more oil than the other although it is what it is. Whatís your opinion?
Reasonably level is ok, the wheel ends should still be full, even when you drain the center section.
If you look head on at fill plug, it'll be just a little higher than bottom of axle housing. Once oil runs out fill hole, it's full.

If wheel hub was removed, then jack opposite side to fill the hub....wait a good bit, then recheck level.
__________________
1999 American Eagle
ASE med/heavy certified technician
ASE advanced diesel certified
mackwrench is offline   Reply With Quote
Old 10-02-2022, 07:21 PM   #9
Senior Member
 
vettenuts's Avatar
 
Join Date: Nov 2013
Posts: 5,516
Differential Oil Change ISC 8.3

I use a laser level to check side to side using a rule to measure. If one side is low, I will drive it up on wood enough to get level.

I used the Mobil Delvac synthetic that meets the Mercedes/Detroit differential specifications and is on their list of approved lubricants. (My coach has the Detroit differential.). Best price was from Summit Racing by quite a bit.
__________________
2015 Tiffin Phaeton 40QBH
2018 Chevrolet Colorado Toad
Roadmaster Tow Setup
vettenuts is offline   Reply With Quote
Old 10-03-2022, 11:02 AM   #10
Senior Member
 
tmw188's Avatar


 
Monaco Owners Club
National RV Owners Club
Workhorse Chassis Owner
Join Date: Dec 2013
Location: St. Charles MO
Posts: 4,755
Send a message via AIM to tmw188
So there is another plug about half way from the top plug which I assume is definitely the fill, what is the other plug for? I originally thought that was the check level plug but is too low for the axles? Click image for larger version

Name:	IMG_5431.JPG
Views:	17
Size:	404.0 KB
ID:	377829
__________________
2002 Monaco Windsor 40PST 2019 Equinox 1.5L, Blue OX Aventa LX tow bar, Roadmaster EZ5 baseplate, SMI Stay-In-Play Duo, TireSafeGuard TPMS
tmw188 is offline   Reply With Quote
Old 10-03-2022, 12:19 PM   #11
Senior Member
 
Join Date: Jul 2014
Posts: 31,769
Quote:
Originally Posted by tmw188 View Post
So there is another plug about half way from the top plug which I assume is definitely the fill, what is the other plug for? I originally thought that was the check level plug but is too low for the axles? Attachment 377829
Differencal oil tempeture sending unit. Some trucks use them.
twinboat is offline   Reply With Quote
Old 10-03-2022, 03:02 PM   #12
Senior Member
 
mackwrench's Avatar
 
American Coach Owners Club
Join Date: Apr 2016
Location: North Florida
Posts: 2,308
Twinboat is correct, the check and fill is the top plug, with the tag. You'll fill it till it runs out that plug hole.

The lower one is for a rear differential fluid temperature sensor....as he posted.
__________________
1999 American Eagle
ASE med/heavy certified technician
ASE advanced diesel certified
mackwrench is offline   Reply With Quote
Old 10-03-2022, 03:56 PM   #13
Senior Member
 
tmw188's Avatar


 
Monaco Owners Club
National RV Owners Club
Workhorse Chassis Owner
Join Date: Dec 2013
Location: St. Charles MO
Posts: 4,755
Send a message via AIM to tmw188
Good, I was wondering about that. Manual is calling for the GL-5 or MT-1 oil spec. Iím assuming a synthetic version of that is good. I donít think the Penzoil version they list is a synthetic?
__________________
2002 Monaco Windsor 40PST 2019 Equinox 1.5L, Blue OX Aventa LX tow bar, Roadmaster EZ5 baseplate, SMI Stay-In-Play Duo, TireSafeGuard TPMS
tmw188 is offline   Reply With Quote
Old 10-03-2022, 04:34 PM   #14
Senior Member
 
mackwrench's Avatar
 
American Coach Owners Club
Join Date: Apr 2016
Location: North Florida
Posts: 2,308
Quote:
Originally Posted by tmw188 View Post
Good, I was wondering about that. Manual is calling for the GL-5 or MT-1 oil spec. Iím assuming a synthetic version of that is good. I donít think the Penzoil version they list is a synthetic?
Not sure, but any GL-5 synthetic will be fine. I use Mobil 75W-140
__________________
1999 American Eagle
ASE med/heavy certified technician
ASE advanced diesel certified
mackwrench is offline   Reply With Quote
Reply

Tags
oil change



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
2016 F 53 22K chassis rear differential oil change? KTM251ss Ford Motorhome Chassis Forum 7 10-07-2018 06:48 AM
Timeframe to Change Differential Oil stevedenesha Entegra Owner's Forum 7 04-15-2017 08:50 PM
Differential Oil Change Don and Kim Workhorse and Chevrolet Chassis Motorhome Forum 13 02-10-2010 07:59 AM
FL Differential Annual Oil Change? Old Snipe Freightliner Motorhome Chassis Forum 4 05-15-2008 05:11 PM

» Featured Campgrounds

Reviews provided by


All times are GMT -6. The time now is 08:15 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2022, vBulletin Solutions, Inc.