Transmission fluid, which is thinner Amsoil or Mobil 1?

[302Xplorer]

My 2000 Ford Explorer 5.0/AWD is fast approaching 100K. I am going to be changing out all of the fluids tranny, T/C, front and rear differentials.

I am going to be running the lightest (viscosity) fluids all around. I understand how to tell w/ most all fluids, but am stumped as to how to tell w/ transmission fluid, any help would be appreciated.

-302X

 

[aldive]

Are you doing this for improved gas mileage?

 

[302Xplorer]

Are you doing this for improved gas mileage?

Yes Sir!

Funny you should be the first to reply. I was just getting ready to look up what it is that you are using on your 2nd gen.

I average about 15 mpg and am looking to improve on it.

 

[aldive]

I use Amsoil ATF.

 

[302Xplorer]

I use Amsoil ATF.

Any idea if it is thinner than M1?

What weight do you use in each of your differentials?

 

[302Xplorer]

Looks like Amsoil is thinner.

AMSOIL Synthetic Universal Automatic Transmission Fluid (ATF)
Kinematic Viscosity @ 100°C, cSt (ASTM D-445) 6.8
Kinematic Viscosity @ 40°C, cSt (ASTM D-445) 32.4
Viscosity Index (ASTM D-2270) 172
Noack Volatility, % weight loss (ASTM D-5800) 11.0
Flash Point °C (°F) (ASTM D-92) 220 (428)


Mobil 1 Synthetic ATF
Viscosity, ASTM D 445
cSt @ 40º C 36.3
cSt @ 100º C 7.4
Viscosity Index, ASTM D 2270 176
Pour Point, ºC, ASTM D 97 -41C
Flash Point, ºC, ASTM D 92 200

 

[aldive]

Any idea if it is thinner than M1?

I doubt that there is a significant difference.

What weight do you use in each of your differentials?

I use Amsoil Severe Gear 75W-90 ( https://www.amsoil.com/a/synthetic-gear-oil ).