Rear Differential Oil

[B1gJack]

If someday, I would want to change the oil in my 2009 Dodge 1500, 5.7L pickup's differential, what would I use? Did synthetic come from the factory?
In ordinary use, when should it be changed?
My F150,which I traded in for the Dodge, had 111,000 miles on it with the original oil in the differential without any problems.
Should I use synthetic or ordinary oil? What weights?
Thanks,
Jack

 

[DieselTech]

Amsoil or Redline!! Im not sure what the 1500 takes but the ford too 75-140. I have been usinf Amsoil for years, but I did pickup some redline 75-140 for my F150 today

 

[Ben99GT]

I would use this:

http://www.redlineoil.com/product.aspx?pid=134&pcid=4

In fact I just did in my own truck.

 

[Colt45ws]

Red Line or Amsoil 75W140. I would change it at around 25k, then not again until 75-100k.

 

[zrxkawboy]

Look in your manual, but it probably calls for syn.

 

[panthermike]

Schaeffer's, Amsoil, or Redline.

 

[Colt45ws]

Originally Posted By: panthermike
Schaeffer's

Do they even sell any gear oil in quarts? Last I looked, they want you to buy it by the pail.

 

[XJ1100]

Originally Posted By: Onmo'Eegusee
Originally Posted By: panthermike
Schaeffer's

Do they even sell any gear oil in quarts? Last I looked, they want you to buy it by the pail.


Yes- My local NAPA actually carries Schaeffer's products and sells motor oil, transmission fluid, and gear oil in quart bottles.

 

[Colt45ws]

Their website must be out of date then. I just went and looked through the product pages for all of their gear lubes. It shows a pail is the smallest size.

 

[tig1]

M1s diff oil will work great for you I have used it in the past with excellant results. My sons old Ranger has it in the diff with 336,000 miles with only one oil change during that time.

 

[Ben99GT]

M1's gear oil specs are underwhelming IMHO, and ARE group III.

Originally Posted By: Mobil 1
Mobil 1 Synthetic Gear Lubricant LS 75W-140 combines wax-free synthesized hydrocarbon base oils...


As infrequently as diff fluid is changed, you might as well go for the good stuff. Not to mention M1 75W-140 sells for ridiculous money in my area, usually over $15/qt.

 

[Doug Hillary]

Hi,
Ben99GT - I have always believed that Castrol made some of the most advanced gear and transmission fluids available. My experience with these go back several decades

About 1998 I commenced side by side comparisons with GL5 fluids - Mobil 1 75W-90 and Castrol's Syntrax 75W-90. These vehicles ran in varying ambient temps and at utilisation rate at about 225-250kkms annually

At 1 million kms (or four year) OCIs and using UOAs and component attention data I could not detect any differences at all! I had no component failures and no seal issues

So there are many good synthetic fluids for these applications - Castrol and Mobil products are two of them!

 

[artificialist]

Odds are that the manual calls for 75w140 synthetic.

Buy whatever 75w140 synthetic is easily available and not expensive.

Typically I go to NAPA and pay $12-$15 per quart.

It comes with limited slip additives from the factory.

 

[Ben99GT]

Originally Posted By: artificialist
Typically I go to NAPA and pay $12-$15 per quart.


Which I can no longer bring myself to do, not when I can get RL or Amsoil SG for $11-12 off of the 'net. And IMO, those two fluids are better than anything you can buy at the local parts house or at Wal-Mart.