What are we all running in our differentials ?

[nickycee]

This is an old thread but I though I would chime in. After a few months of research and talking to mechanics and oil experts, I run Amsoil Severe Gear 75W-90 in the rear differential and transfer case of my 2002 RX300. Running like new at 144,000 miles.

 

[StevieC]

I just put Amsoil Severe Gear 75w90 in my Transfer Case and Diff in the Highlander.

 

[RyanY]

Valvoline syn 75w90 (LS) in the Cad.

 

[1JZ_E46]

Redline 75W-110 in the BMW
Redline 75W-85 (rear diff) and 75W-90 (tcase) in the Mini

 

[dawgn86]

Valvoline Synthetic 75w-90 or Mobil 1 75w-90 in the rear.

 

[MolaKule]

Custom 75W110 GL-5 rated.

 

[nthach]

Red Line 75W-90 in my parent's car. ST 75W-140 in an friend's Explorer and M1 75W-90 in a Subaru I maintain.

 

[BrianF]

Amsoil 75w90 in the Trailblazer. Co-op SL 80w140 in the Ram. Co-op 75w90 will go in the front when the time comes.

 

[buck91]

Amsoil 75w140 in my F150 rear with SynPower 75w90 in the front. Mustang has shop bulk 85w140. Explorer is running Amsoil75w140 and 75w90.

 

[raburn2906]

Valvoline 75W140 Synthetic

 

[userfriendly]

I'm with zeng on this thread. Switching from 75W90 to 80W140 Petro-Can as I go along.

2013 1500 SLT 5.3
2011 2500 SLE 6.6
2018 3500 High Country 6.6
2008 Ram 3500 6.7

A handful of 2500 SLE 6.0L company trucks can have my almost stale-dated 75W90 left overs for free.

 

[zeng]

Originally Posted by userfriendly
I'm with zeng on this thread. Switching from 75W90 to 80W140 Petro-Can as I go along.

2013 1500 SLT 5.3
2011 2500 SLE 6.6
2018 3500 High Country 6.6
2008 Ram 3500 6.7

A handful of 2500 SLE 6.0L company trucks can have my almost stale-dated 75W90 left overs for free.

After switching to xW140 , care to comment whether you observe a lower differential temperature under a typically harsh operating conditions ?

 

[4WD]

Delvac 1 75W90 in 2010 GMC and same will go in 2017 Tahoe … front will get M1 …

 

[HemiHawk]

Just got some 75w90 for my 95 Mustang. I guess that was the requirement back then. Since maybe 05 its been 75w140. I changed out my 08 Mustang's diff fluid with 75w140 and felt way less drag on the drivetrain. We'll see how the 75w90 does in the 95. I'm not too worried about it being lower visc. Its RedLine so it should be decent stuff.

 

[Coventry]

Australian 2005 Ford Falcon custom 4-pinion LSD set up tight for towing. Amsoil 75W110

 

[ofelas]

Severe Gear 75w110 in both diffs & transfer case on my diesel pickup; 75w110 on the gasoline pickups
Severe Gear 75w90 in the cars/Jeep

 

[-SyN-]

Ram - Front = Factory Fill / Rear = RL 75W-90/140 combo.
GMC Z71 - Front & Rear = RL 75W-90

 

[Tikka]

Petronas fully synthetic 75-140 in a Grand Cherokee with open diffs.

 

[userfriendly]

Zeng; Pick-up trucks only monitor trans fluid temperature. I believe that at higher speeds, the 80W140 will run hotter than 75W90 because of fluid friction. At high loads and slow speeds, such as in your mining equipment the thicker fluids likely run cooler due to reduced mechanical friction.

I bought a 5 gallon pail of Chevron 80W140 today to convert 3 GMC 2500 company trucks. Fuel economy is a non-issue.

 

[dustyroads]

M1 75W-140 in rear diff

I believe my front diff still has factory fill. Need to decide what to run and service it in next few weeks.