Is there an 80/90 synthetic?

[DirtyApe]

Was checking the maintenance manual for my g37 AWD and see that it calls for GL-5 80w-90. I presume this is a dino since 80-90 is almost exclusively NOT synthetic?

The only synthetic (and it's a synthetic blend) 80-90 I can find is durablend 80-90.. I was wanting to run redline but the best I can find is 75-90 and I don't think that's a good thing to deviate to.

any thoughts?

 

[MetalSlug]

AMSOILS made 80w90 synthetic I think.

 

[simple_gifts]

Amsoil; i use it in my b2300

http://www.amsoil.com/storefront/agl.aspx

 

[Johnny]

Amsoil makes an excellent 80W-90.

Amsoil 80W-90 Here.

 

[05ChevyI5]

Nothing wrong with the 75w-90 Severe Gear in that app as well.
AMSOIL SEVERE GEAR® (75W-90) provides superior performance and replaces competitors’ 75W-90 and 80W-90 gear oils. It delivers the best fuel efficiency and cold temperature performance of the Severe Gear oils.

 

[aquariuscsm]

Another recommendation for Amsoil AGL 80W90 GL5. That`s what I have in my car`s rear diff.

 

[unDummy]

Any full synthetic 75w90 can also be used.

 

[mechtech2]

I also think any 75-90 will work just great. Probably better.

 

[hisilver]

Not a full syn, but Valvoline DuraBlend is an available 80w90.

 

[DirtyApe]

Originally Posted By: hisilver
Not a full syn, but Valvoline DuraBlend is an available 80w90.


I had been looking at this one, but wasn't sure if synthetic was not recommended since it didn't specifically specify?

 

[unDummy]

Originally Posted By: mh2800
I had been looking at this one, but wasn't sure if synthetic was not recommended since it didn't specifically specify?


Quit worrying. Use the blend or any full synthetic.

 

[Bror Jace]

"Quit worrying. Use the blend or any full synthetic."

Or this GL-4/5 80W-90 mineral gear oil:

http://nelsonpetroleum.com/images/delogear.pdf

It's what I'm now using in my S2000's diffy.

 

[DirtyApe]

Originally Posted By: unDummy
Originally Posted By: mh2800
I had been looking at this one, but wasn't sure if synthetic was not recommended since it didn't specifically specify?


Quit worrying. Use the blend or any full synthetic.


but ... but.. I like to worry about my oils, that's why I'm here lol.

 

[tinmanSC]

Unless you're running a specialty application (ie not an automobile) any application that calls for 80w-90 can use 75w-90 as well. Many manufacturers have backspeced their diffs/manual transmissions to reflect this.

 

[DirtyApe]

Originally Posted By: tinmanSC
Unless you're running a specialty application (ie not an automobile) any application that calls for 80w-90 can use 75w-90 as well. Many manufacturers have backspeced their diffs/manual transmissions to reflect this.


May be, but unfortunately the 2011 Infiniti G37X (AWD) manual specifies 80w-90 GL-5, where the RWD G37 is specified 75w-90 GL-5.

Must be something different there, other than my car having 2 differentials.

 

[tinmanSC]

Originally Posted By: mh2800
Originally Posted By: tinmanSC
Unless you're running a specialty application (ie not an automobile) any application that calls for 80w-90 can use 75w-90 as well. Many manufacturers have backspeced their diffs/manual transmissions to reflect this.


May be, but unfortunately the 2011 Infiniti G37X (AWD) manual specifies 80w-90 GL-5, where the RWD G37 is specified 75w-90 GL-5.

Must be something different there, other than my car having 2 differentials.

I can't for the life of me figure out why this would be. Maybe the other models needed a little boost in MPG so they went thinner on startup? I donno. I can't imagine it's a physical limitation of the diff.

 

[DirtyApe]

Originally Posted By: tinmanSC
Originally Posted By: mh2800
Originally Posted By: tinmanSC
Unless you're running a specialty application (ie not an automobile) any application that calls for 80w-90 can use 75w-90 as well. Many manufacturers have backspeced their diffs/manual transmissions to reflect this.


May be, but unfortunately the 2011 Infiniti G37X (AWD) manual specifies 80w-90 GL-5, where the RWD G37 is specified 75w-90 GL-5.

Must be something different there, other than my car having 2 differentials.

I can't for the life of me figure out why this would be. Maybe the other models needed a little boost in MPG so they went thinner on startup? I donno. I can't imagine it's a physical limitation of the diff.


I have called several infiniti service departments and no one seems to know why the AWD version is spec'd 80-90 on the rear and the 2wd model is spec'd for 75-90. 75-90 would be so much easier to choose from.

MAKES NO SENSE!