rear differential oil question - Ford Truck Enthusiasts Forums



2004 - 2008 F150 2004, 2005, 2006, 2007 and 2008 Ford F150's with 5.4 V8, 4.6 V8 engine

rear differential oil question

Reply
 
 
 
LinkBack Thread Tools Search this Thread
  #1  
Old 02-05-2013, 12:46 PM
pepito113 pepito113 is offline
Senior User
Thread Starter
 
Join Date: Jun 2007
Posts: 167
pepito113 is starting off with a positive reputation.
rear differential oil question

Hello Everyone. I have a 2007 ford f150 FX2 5.4 with 3.55 limited slip rear end. It has 68,000 miles and would like to change the rear differential oil. I have read and I know the oil it requires is 75w-140 plus the friction modifier. I would like to use mobile one. But was reading and the mobile one sites states that is already has friction modifiers. Is that ok to use on my truck? Has anyone used mobile one and didnt add the extra modifiers?
Also some other brands say they have friction modifiers as well. Any advice? Should I use mobile one and add extra friction modifier or just go with what it has already?

***** here is a description from mobile one****

Mobil 1 Synthetic Gear Lube 75W-140 LS contains special friction modifiers designed for limited slip-type differentials. In most applications, the addition of special LS (limited slip) additives is not required. For axles requiring the highest level of limited-slip performance, OEM specific LS additives can be added to this fluid.
Reply With Quote
  #2  
Old 02-05-2013, 07:06 PM
cb_13's Avatar
cb_13 cb_13 is online now
Elder User
 
Join Date: Jul 2010
Location: St James, Missouri
Posts: 881
cb_13 has a good reputation on FTE.cb_13 has a good reputation on FTE.
I have used Royal Purple with the friction modifier already in it. No issues. I don't see why you would have issues with the Mobil 1 either.
Reply With Quote
  #3  
Old 02-05-2013, 07:15 PM
sammie0126's Avatar
sammie0126 sammie0126 is offline
Postmaster
 
Join Date: Aug 2012
Location: Westfield, Indiana
Posts: 2,715
sammie0126 has a superb reputationsammie0126 has a superb reputationsammie0126 has a superb reputationsammie0126 has a superb reputationsammie0126 has a superb reputationsammie0126 has a superb reputationsammie0126 has a superb reputationsammie0126 has a superb reputationsammie0126 has a superb reputationsammie0126 has a superb reputationsammie0126 has a superb reputation
+1 on the Royal Purple though -using it with no modifier and no issues. If what you use states modifier "already added" then don't add it.
Reply With Quote
  #4  
Old 02-06-2013, 11:27 AM
pepito113 pepito113 is offline
Senior User
Thread Starter
 
Join Date: Jun 2007
Posts: 167
pepito113 is starting off with a positive reputation.
Ok. Yeah I have seen royal purple and mobile one have friction modifier in it. I would like to change the oil this weekend. Do all brands like royal purple and mobile one have the same amount of friction modifier? I believe my truck calls for 7oz? Is that what those brands have?
Reply With Quote
  #5  
Old 02-07-2013, 10:35 PM
7636074460 7636074460 is offline
Elder User
 
Join Date: Oct 2011
Location: down a red dirt road
Posts: 557
7636074460 is gaining momentum as a positive member of FTE.
it will not hurt to add another additive bottle along with your 2-3 quarts of M1. it doesnt hurt to use it in non-LS rears either as the additive helps keep the heat/wear down and just downright better for things that are metal-to-metal. go ahead if you want, but that oil itself should have plenty in it to meet specification.

we put this bg LS2 in every rear we service

BG Products, Inc.
Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Diff Oil/Friction Modifier? dwild 1997 - 2003 F150 6 09-22-2009 08:58 PM
75w-140 vs. 75w140LS MrBSS Clutch, Transmission, Differential, Axle & Transfer Case 6 08-22-2008 03:23 PM
Friction Modifier in a non-limited slip differential mia Clutch, Transmission, Differential, Axle & Transfer Case 2 04-10-2007 09:52 AM
Limited Slip Differential Fluid Decisions - for better functionality Dsl Lover 1999 to 2016 Super Duty 19 11-30-2006 01:30 PM
To add or not to add? deano2 Oil & Lubrication 3 04-01-2005 08:03 PM


Go Back   Ford Truck Enthusiasts Forums >

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 On
Pingbacks are On
Refbacks are On

Forum Jump


All times are GMT -5. The time now is 09:30 PM.


This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. FordŽ is a registered trademark of the Ford Motor Company.