mobil 1 vs castrol synthetic gear oil????????

[whitearrow]

good evening fellas. i am contemplating synthetic gear oil for my 2010 toyota tundra 4x4. i believe it calls for gl-5 in both the front and rear diffs and the transfer case. what are y'all's thoughts between mobil 1 75w-90 synthetic limited slip vs castrol syntrax 75w-90 synthetic limited slip gear oils? i checked the msds on both and it appears that the mobil 1's flash point is higher but the pour point is lower on the castrol. my truck only has 25,000 on it but its 5 yrs old so i wanna change these out to a synthetic so MAYBE i can get a lil bit better mpg's as a bonus. on a side note i just changed the engine oil to castrol synthetic 0w-20 and a mobil 1 filter so maybe that will help some with mpg's.
thanks and if there are any other better easily avaliable syn gear oils please post up,
eddie

 

[Doug Hillary]

Hi,
whitearrow - I have had extensive experience with both of these products over many years and millions of kms. Their performance variances are negligible

 

[Greasymechtech]

Either for the front diff and xfer case

But, the rear diff might call for 75w85. Toyota/Ford/Honda/GM and Redline have a GL5 75w85.

 

[Black_Thunder]

didn't even know they made a 75w85.



my fords are either spec'ed for 75w90 or 75w140

 

[Black_Thunder]

also may wanna look into what the factory fill is, they might already be filled with synthetic.

 

[Black_Thunder]

http://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=2266409

 

[Jimzz]

Originally Posted By: Doug Hillary
Hi,
whitearrow - I have had extensive experience with both of these products over many years and millions of kms. Their performance variances are negligible



I've only used the Mobil1 myself but I agree with Doug, I doubt you would notice the difference.
I would go for which ever is cheapest.

 

[barkingspider]

Use which ever is cheapest. Your truck will not know the difference? I have used both with zero problems.

 

[Clevy]

Redline shockproof


That is all

 

[MaximaGuy]

Have you considered Redline/Amsoil 75W110 and i have the latter in my x-case and diff, bullet proof stuff!!!

 

[artificialist]

The first thing I would do is look in the owner's manual to determine what fluid is needed.

If you share what the manual says, we can give you better advice.