Go Back   iRV2 Forums > MOTORHOME FORUMS > Class A Motorhome Discussions
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 10-01-2012, 02:02 AM   #1
Senior Member
 
Join Date: Aug 2012
Posts: 390
changing rear end oil to synthetic oil

this is to the diesel pushers. my question is has anyone changed rear end oil to synthetic and recorded if any fuel milage change? i know putting 140 weight in a f150 (my bosses axle seal went out) from synthetic to get it home (truck was under waranty) killed the fuel milage and i think that was a dana 60. so lets hear the feed back.
__________________

__________________
wonderer1 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 10-01-2012, 03:34 AM   #2
Registered User
 
KSCRUDE's Avatar
 
Join Date: Aug 2012
Location: The Land Of Oz RVM17
Posts: 1,592
We run 85-140 mobil one in semi trucks and in my jeep wrangler. That the weight you need in the DP also. Go ahead and change it out, it can't hurt anything. This is a multiple vis oil and will be like a 85 weight when it's cold, and like a 140 weight when it's hot. Best of both worlds! Valvoline also makes a good full synthetic 85-140 gear lube.
__________________

__________________
KSCRUDE is offline   Reply With Quote
Old 10-01-2012, 07:34 AM   #3
Registered User
 
Vintage RV Owners Club
Gulf Streamers Club
Join Date: Oct 2010
Location: Indiana
Posts: 4,954
Doubt you will find a mileage increase, but you will find a temp decrease.
__________________
Midniteoyl is offline   Reply With Quote
Old 10-01-2012, 12:50 PM   #4
Senior Member
 
dons2346's Avatar
 
Country Coach Owners Club
Join Date: Dec 2010
Posts: 4,472
Didn't see any increase in mileage. Don't know about a temp drop as I have never measured it.
__________________
dons2346 is offline   Reply With Quote
Old 10-01-2012, 08:44 PM   #5
Senior Member
 
Hooligan's Avatar
 
Freightliner Owners Club
Join Date: Apr 2002
Location: Pensacola
Posts: 2,204
Changed to synthetic in the differential years ago, no change in mileage... On the other hand, would be suspicious of possible damage to the rear end if there was a noticeable drop in fuel mileage after loosing oil from a seal failure... any noise or vibration??
__________________
Hooligan, Pensacola, Fl -U.S. Coast Guard 1956-1985
2016 Thor Siesta Sprinter 24ST diesel
Our Pug "Lily" & "George" the Newfoundland
Hooligan is offline   Reply With Quote
Old 10-02-2012, 08:34 PM   #6
Junior Member
 
Join Date: Aug 2012
Posts: 11
I do know that syn gear lube does not properly lube below 100 degrees F. I have rebuilt MANY rear diff, in pass cars and trucks that have used syn gear lube from the manufacturer. This wear was caused from the vehcle only going short dist, and the lube never warming up. As for a vehicle that is on the hwy, syn lube is great. lowers diff temp, and increases rear gear life.
__________________
Wrenchbender is offline   Reply With Quote
Old 10-02-2012, 09:24 PM   #7
Registered User
 
Vintage RV Owners Club
Gulf Streamers Club
Join Date: Oct 2010
Location: Indiana
Posts: 4,954
You got me.. why would synth not lube properly below 100F?
__________________
Midniteoyl is offline   Reply With Quote
Old 10-04-2012, 06:46 PM   #8
Member
 
Diesel-Lover's Avatar
 
Join Date: Nov 2002
Location: OH
Posts: 42
Quote:
Originally Posted by Midniteoyl View Post
You got me.. why would synth not lube properly below 100F?
Me too. When syn first came out, I personally put a dyno and syn bottle in the freezer to see which one was more liquid and the syn won, its viscosity remained stable it did not jell.. Similarly using a tobe thrown frying pan ran the test they showed on TV again the syn was more stable where as the dyno was like water.
Not too sure about the seals not liking it, but from my understanding most synthetics have additives in there to assist in keeping the seals from degrading.
__________________
RUSTIC is good.
Kudos to those who make Local, State & Federal Parks & Campgrounds possible and to those picking up the slack by Providing Private Campgrounds.
Diesel-Lover is offline   Reply With Quote
Old 10-04-2012, 07:17 PM   #9
Senior Member
 
Spikester's Avatar
 
Newmar Owners Club
Join Date: Aug 2007
Location: Belfair WA.
Posts: 678
Changed to Synthetic no increase in mileage, but now do not have to change the lube as fotten per the manufacturer. I like less maintenance costs.

Spike
__________________
"Those who stand for nothing fall for anything"
2008 Newmar VTDP - 3330 - ISBXT 350 Spartan NVS
Toad - 2013 Mini Cooper S or 93 Nissan 4WD PU
FMCA F113720, NKK 18573
Spikester is offline   Reply With Quote
Old 10-04-2012, 08:20 PM   #10
Senior Member
 
Damon Owners Club
Join Date: Jul 2010
Location: Annapolis,MD
Posts: 1,193
I changed to Mobil one 75-90 and found a 2% improvement in fuel
economy over the next 8000miles. There are many other benefits
as well.
__________________

__________________
macandphyl is offline   Reply With Quote
Reply



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


» Virginia Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 12:08 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.