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Old 07-08-2011, 07:25 PM   #1 (permalink)
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Default What gear oil for front axle 2000 OB Auto trans

Hello to all in Suby Land!! I need some help, I just bought a 2000 OB with 134000 on it and am changing all the fluids because i dont know the history of service. I read on this Forums or another one not to use Synthetic 75-90 with the limited slip additive in it, but all the parts stores carry it like that. I don't want to burn up anything, please steer me in the right direction.


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DZ
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Old 07-08-2011, 08:07 PM   #2 (permalink)
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Got Valvoline Durablend 80w90 in both the front and rear diff on my 2003. No complaints, as I got it on sale.
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Old 07-08-2011, 08:44 PM   #3 (permalink)
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Quote:
I read on this Forums or another one not to use Synthetic 75-90 with the limited slip additive in it,
I believe this might have been in reference to gear oil for the Manual Transmission. Mobile 1, in particular, is not recommended for use in the Subaru MT due to some impact on the synchronizer metals, or something like that.

As you noted, virtually all widely available GL-5 gear oils (natural and synthetic) I've looked at indicate they are suitable for use in regular and limited slip differentials and/or have related additives. But the reference to limited slip differentials is intended for mechanical clutch types, where the appropriate gear oil can reduce clutch chatter. But the gear oil is otherwise fine for standard differentials and even the Subaru LSDs that use a viscous coupler, which is a sealed component inside the differential.

Many here use Mobil 1 in the differentials, and others use a wide range of different brands and formulations. As long as it meets Subaru's specs, such as GL-5, and is of the correct viscosity (75W-90 or 80W-90) it should be fine.

There's a good thread in the DIY section that might be of help: Changing Front Differential Fluid. Automatic Transmission
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Old 07-09-2011, 01:40 PM   #4 (permalink)
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Quote:
Originally Posted by DaveZeus View Post
please steer me in the right direction.


Thank You
DZ
Amsoil 80W-90.
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Old 07-10-2011, 08:26 AM   #5 (permalink)
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80/90 Front

75/90 Rear

I used the weight that was called for because I had it. If not, 80/90 for both should be fine. Think I used Lucas In one and Valvoline in the other.

Has the timing belt been changed ? If in doubt, might want to put that and all the related items on your list of things to do ... pretty soon. Throw that belt and the diffs won't matter much ;]
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Old 07-10-2011, 10:44 AM   #6 (permalink)
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^^^ that is why I have 80w90 in both, there was no 75w90 on the sale table
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2003 Outback: "Kaylee". 142,000 and counting.
Basics: Quaker State Ultimate Durability 5W30+MOS2, PureOne oil filter, Fram air filter, Valvoline Maxlife Dex/Merc ATF, Mobil 1 75W90, Michelin Primacy MXV4.
Mods: Fumoto oil drain valve, Phillips VisionPlus low beams, HIR1 Phillips high beam upgrade, Nokya Hyper Yellow fog lights.

Also: More rust and parking lot scars than I care to think about.
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Old 07-10-2011, 03:17 PM   #7 (permalink)
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Thanks for the answers, so I should be fine as long as the GL5 is used? I have been thinking about timing belt, from what I can tell this was a one owner car from Cali, I got it from a little car lot thats been around for ever and here good thing about the cars they sell, I would like to think that the belt has been changed by know being that it has 134000 and change but I cant be sure so yeah a belt is in order, any belts you guys recommend dealer or name brand from parts store?? Thanks Again
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Old 07-11-2011, 09:48 PM   #8 (permalink)
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Yes, you should be fine. Subaru differentials hardly EVER fail. I use Renewable Lube in mine.
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