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#1851326 - 04/09/10 06:39 PM Ok to use 75W-90 Syn in Diff that req SAE 80?
RageOfFury Offline


Registered: 11/15/09
Posts: 288
Loc: Ottawa, Canada
I have a Yamaha ATV (1999 Kodiak 400). I'm going to change out the front and rear differential fluids this weekend. This is what the owner's manual states:

Quote:
Rear Diff : SAE 80 API "GL-4" Hypoid gear oil
Front Diff : SAE 80 or SAE 80W-90 API "GL-5" Hypoid gear oil.


So I went to walmart and canadian tire. Now canadian tire had 75W-90 full synthetic GL-5 hypoid gear oil. Can I use that in both the front and rear? What would be best? What do you guys recommend?

Thanks Canada
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#1851347 - 04/09/10 06:59 PM Re: Ok to use 75W-90 Syn in Diff that req SAE 80? [Re: RageOfFury]
Johnny Offline


Registered: 05/27/02
Posts: 14013
Loc: Retired | Wausau, WI
You probably could, but I think I would use a regular 80W-90 in there. Sometimes Walmart carries Shell Spirax 80W-90 in quarts and that would make a good gear oil for your application.

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#1851384 - 04/09/10 07:29 PM Re: Ok to use 75W-90 Syn in Diff that req SAE 80? [Re: Johnny]
RageOfFury Offline


Registered: 11/15/09
Posts: 288
Loc: Ottawa, Canada
Well they also have regular 80W-90 that meets both GL-4 and GL-5.

Why not the 75W-90 synthetic though? shrug
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#1851528 - 04/09/10 09:13 PM Re: Ok to use 75W-90 Syn in Diff that req SAE 80? [Re: RageOfFury]
Ben99GT Offline


Registered: 02/25/05
Posts: 4303
Loc: MS
You can use 75W-90 with no problem.
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#1851684 - 04/10/10 12:37 AM Re: Ok to use 75W-90 Syn in Diff that req SAE 80? [Re: Ben99GT]
unDummy Offline


Registered: 02/01/03
Posts: 8756
Loc: RI
It's ok to use. But, if you'll lose an ounce of hp with the thicker gear oil.

The rear-end must be bigger/stronger and/or has a larger sump then the front-end since it only requires a SAE80/GL4 gear oil. SAE80 is 7cst(like ATF)-11cst(MTF/MTL). I would use Redline MTL, Amsoil MTF, or other equivalent GL4 fluid in the rearend. If you don't mind the ounce of power lose, use the 75w90 GL5.

The front-end requires a GL5. Is it overly stressed? There are not too many SAE80 GL5 gear oil, and 75w85 GL5's are pretty tough to find(Redline/Toyota/...). I would definitely use ANY full synthetic 75w90 GL5 in the front end.
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#1851834 - 04/10/10 07:13 AM Re: Ok to use 75W-90 Syn in Diff that req SAE 80? [Re: unDummy]
RageOfFury Offline


Registered: 11/15/09
Posts: 288
Loc: Ottawa, Canada
Originally Posted By: unDummy
It's ok to use. But, if you'll lose an ounce of hp with the thicker gear oil.

The rear-end must be bigger/stronger and/or has a larger sump then the front-end since it only requires a SAE80/GL4 gear oil. SAE80 is 7cst(like ATF)-11cst(MTF/MTL). I would use Redline MTL, Amsoil MTF, or other equivalent GL4 fluid in the rearend. If you don't mind the ounce of power lose, use the 75w90 GL5.

The front-end requires a GL5. Is it overly stressed? There are not too many SAE80 GL5 gear oil, and 75w85 GL5's are pretty tough to find(Redline/Toyota/...). I would definitely use ANY full synthetic 75w90 GL5 in the front end.

So 80W-90 dino in the rear, 75W-90 syn in the front? Is 75W-90 syn good for LSD? The front diff is a limited slip differential.
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#1851853 - 04/10/10 07:56 AM Re: Ok to use 75W-90 Syn in Diff that req SAE 80? [Re: RageOfFury]
unDummy Offline


Registered: 02/01/03
Posts: 8756
Loc: RI
I would use 75w90 in both and most synth's have the LSD additive if needed for your application.
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#1852458 - 04/10/10 07:21 PM Re: Ok to use 75W-90 Syn in Diff that req SAE 80? [Re: unDummy]
RageOfFury Offline


Registered: 11/15/09
Posts: 288
Loc: Ottawa, Canada
In the end I went with Yamalube Drive Shaft Gear Lube (SAE 80W-90).

Both diff fluids have never been changed since I bought the Kodiak back in 1999. hide Let me tell you, it was quite dark.
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