'13 Infiniti g37x F/R diff - spec'd 80w90 conv??

[DirtyApe]

I am coming up on 2500 miles on my '13 G37x AWD Infiniti. I"d like to dump the f/r diffs to get any shavings and trash out from the break-in and assembly process.

I was checking and they are only spec'd for 80w90 front and rear. An AWD car using conventional in the differentials? I should add the rear is a VLSD also.

I'd sure like some synthetic in there or at least a blend but would really feel better staying in the grade that is specified.

What would you oil gurus recommend?

 

[skyactiv]

This would be the rare time I might use Amsoil.

 

[Cold_Canuk]

Amsoil 80W90 - It's synthetic
http://www.amsoil.com/shop/by-product/gear-lube/synthetic-80w-90-gear-lube/?code=AGLQT-EA

 

[GSCJR]

I use this 80w-90 in just about every diff and transfer case. It is also in my personal vehicles (see below). No additives required. Just my 2c.

http://www.hollonoil.com/InventoryProductSheets/QuakerState/HighPerformanceGearLubricant.pdf

 

[JHZR2]

Not sure why there is both 75w-90 and 80w-90, but there is... I'd probably use Amsoil svg 75w-90, but their 80w-90 is surely good too.

M1 is also a great gear lube available local if the 75 v 80 doesnt bother.

 

[dparm]

How much does the Nissan fluid cost?

 

[aquariuscsm]

I use Amsoil AGL 80W90. That would be my recommendation.

 

[Towncivilian]

I put Amsoil SVG 75W-90 in my mom's '12 G37s at around 6k miles. No problems yet.

 

[Garak]

I used the RP 75w-90.

 

[DirtyApe]

The 'nissan' stuff they will sell me is pennzoil 80-90 at $14/qt.

 

[DirtyApe]

They spec the 75-90 for non-awd models, but not for the awd ones.

 

[DirtyApe]

Originally Posted By: GSCJR
I use this 80w-90 in just about every diff and transfer case. It is also in my personal vehicles (see below). No additives required. Just my 2c.

http://www.hollonoil.com/InventoryProductSheets/QuakerState/HighPerformanceGearLubricant.pdf


Oddly enough I've not seen QS gear lube around here .

 

[The Critic]

I'll just say that my friend's Infiniti repair shop had used nothing but Amsoil Severe Gear 75w-90 in all G35/G37/M35/FX35 since 2005 without any known issues.

 

[Garak]

Originally Posted By: DirtyApe
They spec the 75-90 for non-awd models, but not for the awd ones.

I'm not positive off the top of my head, but I believe my manual specified 80w-90. Nonetheless, the difference between the 75w-90 and 80w-90 is negligible (including in respect to pricing), so I went for the synthetic 75w-90.

 

[artificialist]

Any 80w90 conventional can do the job, and a 75w90 synthetic may improve performance.

The nice thing about 80w90 conventional is that you can often buy it per gallon at a better price than per quart.

 

[sprintman]

Amsoil or Redline 75W90

 

[Garak]

True. By the quart jug, though, the synthetic was pretty competitive. The difference between 80w-90 conventional and 75w-90 synthetic up here isn't the usual double the price deal for synthetic. The prices were much, much closer.

 

[vq35de_touring]

I used Mobil 1 75w-90 in my Z that specs the exact same conventional 80w-90/gl-5 you need about a year ago. Valvoline offers a synthetic blend 80w-90 that I used in our FX35. Its their durablend 80w-90 in a blue quart sized bottle. Both of those differentials are exactly the same if I'm not mistaken.

The only difference I could tell between both situations was the price as the durablend was cheaper per quart.

Any synthetic 75w-90/ gl-5 will do just fine.