Which gear oil in rear diff

[nvestor88]

Which oil are members putting in their 4th gen rear differentials?

 

[MATTPENN21]

75-140 toyota

I run Toyota 75w-140 in both diffs and transfer case. toyota p/n 00289-75140.

 

[Gatafly]

Amsoil Severe Gear 75W-90

 

[ZebRuaj]

Valvoline synpower 1st go round.
M1 was on sale this past week so I stocked up for spring maintenance.

 

[catrains]

Which oil are members putting in their 4th gen rear differentials?

in our cold area best use the 75-90wt. ... in the 100 deg F plus areas many use the higher viscosity .. gear oil gets very hot down there..

in the cold below 20 deg f that heavy oil would be a problem for us..

 

[Inv4drZm]

Amsoil Severe Gear 75w-90 is popular, as well as Mobil 1 75w-90 (what I am using)

75w-140 from what I have hear might benefit the offroad crowd.

 

[fdbyrne]

I use the Lucas 85w-140 that ECGS recommended with the differential that I bought from them. No issues at all and no noticeable hit to MPGs from using the thicker stuff.

 

[riceandpho]

Amsoil Severe Gear 75w-90
buy it from topshelf synthetics
first i used lucas oil 75w-90, bought the gallon jugs from summit racing since it is cheap.

 

[super.secret]

Redline brand has taken really great care of me over the years.

 

[Mike07SE]

I also use Lucas 85w-140 that ECGS recommended when I had my diffs done. No issues with it.

 

[Rodtheviking]

Mobile 1 or Redline GL-5 75-90w