Can I use Valvoline SynPower 75W90 Gear Oil in differentials?

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Aug 5, 2018 | 08:44 AM

Brewcity1

Thread Starter

Junior Member

Joined: Jul 2018

Posts: 14

From: Milwaukee

Can I use Valvoline SynPower 75W90 Gear Oil in differentials?

Hey guys....sorry for all the questions.
I searched this forum, and found no clear answer about what differential fluid we are to use.
I thought we needed 80W90 differential fluid for the full sized 3.5 Monteros. Am I correct in this?
I have the 2002 Limited, so I assume that the rear is Limited Slip, so can I use the Valvoline SynPower 75W90 for both front and rear?
I just want to make sure I get the correct fluid before the change.
Also...how many quarts for the front and rear?

Thank you for all the help.

Aug 5, 2018 | 05:57 PM

HunterD

Senior Member

Joined: Oct 2004

Posts: 2,044

From: Washington State

You definitely can use it in the front diff and in the transfer case. Does the Valvoline say its compatible with LSD? If so - go for it.

Aug 5, 2018 | 06:03 PM

Brewcity1

Thread Starter

Junior Member

Joined: Jul 2018

Posts: 14

From: Milwaukee

Quote:

Originally Posted by HunterD

You definitely can use it in the front diff and in the transfer case. Does the Valvoline say its compatible with LSD? If so - go for it.

Thanks so much!! It does say its LSD compatible.
What weight do I use for the fron and rear diff's...and what do I use for the transfer case?

Thanks again for all the help.

Aug 5, 2018 | 06:14 PM

HunterD

Senior Member

Joined: Oct 2004

Posts: 2,044

From: Washington State

FRONT AXLE
Check that the gear oil level is not more than 8 mm (0.3 inch) below the
bottom of the filler plug hole.
Specified gear oil:
Hypoid gear oil API classification
GL-5 or higher, SAE viscosity Number 90, 80W [1.15
dm3 (1.22 quart)]

REAR DIFFERENTIAL
Check that gear oil level is not 5 mm (0.2 inch) below the bot-
tom of filler plug hole.
Specified gear oil:
Hypoid gear oil API classification GL-5 or higher
SAE viscosity Number 90, 80W

TRANSFER CASE
Add the oil until the level comes to the lower portion of the
filler plug hole.
Specified oil:
Hypoid gear oil SAE 75W-90 or 75W-85W conforming
to API classification GL-4
Quantity: 2.8 dm3 (3.0 quarts)