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#1818898 - 03/15/10 09:16 PM SAE 90 GL5 gear oil suggestions.
dave63 Online   content


Registered: 02/07/09
Posts: 4
Loc: colorado
It's time to service the front and rear diffs in my Kia. The manual specifies SAE90 GL5 and Kia customer service confirmed that SAE90 straight weight is what I need to use to maintain warranty. I have located 3 gear lubes that are readily available that meet the spec. 1)Motul PA-90 2)Bel-ray Gear Saver SAE90 3)PJ1 hypoid gear oil. I also considered LE1604 but it is harder to find. What would you guys suggest?
_________________________
2002 Chevrolet Suburban
2008 Kia Sorento

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#1818904 - 03/15/10 09:21 PM Re: SAE 90 GL5 gear oil suggestions. [Re: dave63]
aquariuscsm Offline


Registered: 12/30/06
Posts: 10074
Loc: South Texas,USA
From what I understand,Motul is supposed to be one of the best of the best! I`d just go for that one.
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1996 Nissan 300ZX 5-speed,Arctic Pearl(#175 of 300)
Syntec 10W40/Fram Ultra
Amsoil MTG(tranny)
Amsoil 80W90 GL5(rear diff)
Mobil 1 ATF
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#1818960 - 03/15/10 10:15 PM Re: SAE 90 GL5 gear oil suggestions. [Re: aquariuscsm]
bmwtechguy Offline


Registered: 06/15/04
Posts: 2526
Loc: South Carolina
I have a hard time believing that a straight SAE 90 mineral GL5 gear oil is something that would be good for any differential operating during a Colorado winter. Would not lubricate when extremely cold, but probably stay semi-solid. I would at least use a synthetic like 80W-90 Amsoil. Better yet, use Severe Gear 75W-90. This is what any modern car specifies, a 75W-90 grade gear oil. You do not want a straight SAE 90 in there during the winter, trust me.

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#1818997 - 03/15/10 11:10 PM Re: SAE 90 GL5 gear oil suggestions. [Re: bmwtechguy]
unDummy Offline


Registered: 02/01/03
Posts: 8756
Loc: RI
I use M1 75w90 in my Sportage. Could care less what it calls for!

If you tow or work the vehicle, you could step up to a 75w110 from Amsoil, Klotz, or JoeGibbs.
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#1819455 - 03/16/10 12:57 PM Re: SAE 90 GL5 gear oil suggestions. [Re: unDummy]
mechtech2 Offline


Registered: 09/05/06
Posts: 19479
Loc: Chicago Area
A straight weight gear oil is a bad choice for a street car.
A 75-90 or similar is much wiser.
I'd use a full synthetic gear oil in any differential or transmission.

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#1819738 - 03/16/10 04:23 PM Re: SAE 90 GL5 gear oil suggestions. [Re: mechtech2]
dailydriver Offline


Registered: 03/14/06
Posts: 7212
Loc: Bucks County, Pa.
Did the service techs specifically state that it HAD TO BE a mineral based gear oil??
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#1819903 - 03/16/10 06:44 PM Re: SAE 90 GL5 gear oil suggestions. [Re: dave63]
Doug Hillary Offline


Registered: 05/30/03
Posts: 4883
Loc: Airlie Beach Australia
Hi,
dave63 - Welcome to BITOG

To assist you please provide full information about your vehicle
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Regards
Doug

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#1820176 - 03/16/10 10:56 PM Re: SAE 90 GL5 gear oil suggestions. [Re: Doug Hillary]
dave63 Online   content


Registered: 02/07/09
Posts: 4
Loc: colorado
Thanks for the responses. The vehicle is a 2008 KIA Sorento 3.8l with Torque on Demand AWD. I specifically asked KIA America when I called them as to why a modern vehicle is using straight weight mineral gear oil and they said SAE90 was the factory fill and that is what was tested in the car. KIA tech service did say the factory fill of SAE90 has a lot of moly so it will appear nearly black but they would not recommend a multi weight to use as an alternative. I originally thought of going with amsoil severe gear 75w90 or 75w110 until I re-read the manual and SAE90 was spec'd for the diffs. I have heard Hyundai/Kia will try to get out of the 10yr warranty if the owners manual is not followed to the letter.
_________________________
2002 Chevrolet Suburban
2008 Kia Sorento

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#1820177 - 03/16/10 10:59 PM Re: SAE 90 GL5 gear oil suggestions. [Re: dave63]
Doug Hillary Offline


Registered: 05/30/03
Posts: 4883
Loc: Airlie Beach Australia
Hi,
dave63 - Simple answer then - follow the Manufacturer's Warranty requirements without fail!
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Regards
Doug

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#1820951 - 03/17/10 04:11 PM Re: SAE 90 GL5 gear oil suggestions. [Re: dave63]
dailydriver Offline


Registered: 03/14/06
Posts: 7212
Loc: Bucks County, Pa.
Originally Posted By: dave63
KIA tech service did say the factory fill of SAE90 has a lot of moly so it will appear nearly black but they would not recommend a multi weight to use as an alternative.


I believe that the Motul PA-90 you mentioned in the o.p. has a good amount of moly in it (anyone know for sure??).
_________________________
2000 Z28 1SC 6 speed 175K miles
Red Line 0W-40/Sustina 0W-20 (20/80 mix)
Fram Ultra filter
Synpower 75W-140/4oz. XL-3
Red Line D4 in the T56

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#1821189 - 03/17/10 07:13 PM Re: SAE 90 GL5 gear oil suggestions. [Re: dailydriver]
bmwtechguy Offline


Registered: 06/15/04
Posts: 2526
Loc: South Carolina
My guess is that they are calling their moly Sae 90 gear oil a straight grade, but it is most likely really a multi-grade. Maybe this time use their oil just because of your warranty concerns, then step up to your original choice after warranty is up. Save your receipts!

For me, I would just go ahead with the better gear oil now.

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#1821387 - 03/17/10 10:07 PM Re: SAE 90 GL5 gear oil suggestions. [Re: bmwtechguy]
westcoaster Offline


Registered: 03/04/07
Posts: 65
Loc: British Columbia, Canada
I too have an 06 Sorento but I have the 4wd, part time. I am also in the mood to change my diffs. I went to the dealership and asked. They had a current cross reference in regards to this question and they advised a 75W-90 Synthetic for the front and rear. The serive manager said that they fill diffs with this fluid.

From what I have read and found out, straight 90 is more like a marine application and very hard to find. All I was able to find was a Shell 90 weight, but it was spacifically for outboard applications.
I think that you will have no issue with going for a synthetic 75-90 gear oil. The transfer case is specd for a dexron III as well which is not hard to find.

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#1821426 - 03/17/10 11:00 PM Re: SAE 90 GL5 gear oil suggestions. [Re: westcoaster]
Kiwi_ME Offline


Registered: 10/24/08
Posts: 732
Loc: New Zealand
Perhaps just buy the oil from the dealer?

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#1824789 - 03/20/10 05:38 PM Re: SAE 90 GL5 gear oil suggestions. [Re: Kiwi_ME]
ARCOgraphite Offline


Registered: 05/17/09
Posts: 8695
Loc: N.H, U.S.A.
STD Valvoline or Penn or Warren 80w-90 should do fine this is not a Cheyenne with a 454 big block.
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#1827471 - 03/22/10 08:51 PM Re: SAE 90 GL5 gear oil suggestions. [Re: ARCOgraphite]
artificialist Offline


Registered: 09/23/07
Posts: 7043
Loc: Florida
Originally Posted By: ARCOgraphite
STD Valvoline or Penn or Warren 80w-90 should do fine this is not a Cheyenne with a 454 big block.

Granted this truck will not have as much torque as an the 454, but many newer trucks have small sumps, small internal components, and very little airflow to cool the gear oil, that is why some new trucks can be more demanding than trucks from the past.
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2010 Lancer Ralliart Sportback

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