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Old 08-06-2010, 07:29 PM   #1
MaxPower
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Default Gear oils for my 94 WRX? All of them. What kind to use?

The owner's manual is in Japanese, so its no help.

I want to change out all gear oils in the car and I don't mind spending money on quality oils. I assume trans, front diff, rear diff, right? Or is it just trans and rear diff? Center diff? I have no idea how the specifics of it work. I haven't seen the car from beneath.

And throwing this one out there. Anyone know the capacities?
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Old 08-06-2010, 07:47 PM   #2
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I used the GrimmSpeed Tranny Cocktail. It works great; check it out.
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Old 08-06-2010, 08:23 PM   #3
Matt Monson
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DO NOT MIX DIFFERENT GEAR OILS!!! All the "cocktails" are total BS.

If you can get Mobil1 Delvac where you are, use that in the gearbox. The gearbox contains the front and center differentials. In the rear end use Redline LW shockproof.

I don't post this in the Tranny forum because that place is littered with self proclaimed experts who don't know what they are talking about. You won't find me endorsing anything there. You will find many people telling you other things there.
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Old 08-07-2010, 12:18 AM   #4
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Quote:
Originally Posted by Matt Monson View Post
DO NOT MIX DIFFERENT GEAR OILS!!! All the "cocktails" are total BS.

If you can get Mobil1 Delvac where you are, use that in the gearbox. The gearbox contains the front and center differentials. In the rear end use Redline LW shockproof.

I don't post this in the Tranny forum because that place is littered with self proclaimed experts who don't know what they are talking about. You won't find me endorsing anything there. You will find many people telling you other things there.
Could you argue with Uncle Scotty and prove yourself right?

I'm curious too. I'm curious about why the 'Scotty's cocktail' is popular and "effective."

Why not mix fluids?
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Old 08-07-2010, 01:28 AM   #5
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I'm pretty sure MM can since he does this for a living.

Speaking of which, I forgot what you recommended I use in my trans. I've only driven the car around 7000 miles, but I figured it would be good to know when the appropriate time comes.
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Old 08-07-2010, 03:41 AM   #6
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I always stick with what the factory recommends: 75W90 gear oil.
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Old 08-07-2010, 01:56 PM   #7
MaxPower
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Do I use GL4 or GL5? Or other?
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Old 08-07-2010, 02:29 PM   #8
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I used GL-5 before.
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Old 08-07-2010, 10:03 PM   #9
Matt Monson
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Quote:
Originally Posted by Da-Risin-Smoke View Post
Could you argue with Uncle Scotty and prove yourself right?

I'm curious too. I'm curious about why the 'Scotty's cocktail' is popular and "effective."

Why not mix fluids?
Why not? Because it's a waste of your time and money to buy single quarts and mix them when you can just get a gallon jug and pour it in there.. There's not some deep mystical chemical explanation not to do it, though many have argued from that anglein the transmission forum against using.

As Dave mentioned, what I do for a living is manufacture gears and LSDs for Porsche gearboxes, primarily for use in motorsports. Though a lot of our clientele daily drive their cars and "just" use them for DEs. They're sportscars and track or not Porsche owners, like Subaru owners, like nice things and they drive their cars hard wherever they go.

The modern Getrag Porsche gearboxes use a 3 piece synchronizer assembly for 1st and 2nd gear, much like the Aisin gearboxes do. And like many of the Subaru guys, the Porsche guys develop shifting problems in those positions that they attempt to remedy through various choices of gear oil and they argue about it just like the Subaru guys do. Furthermore, just like a Subaru, all of our Porsche gearboxes are transaxles, containing a differential and ring and pinion, and as such should be run with a GL5 oil.

That said, we recommend the Delvac because of the particular mix of oil and detergents and additives has shown itself to be quite durable in a racing environment and the long term wear characteristics are very good. In particular, when coupled with our LSD, which adds upwards of 20-30 degrees F to gearbox temperatures, the oil holds up very well. This is why we recommend it.

One other thing I would like to point out, that I think is way way more relevant than exactly what gear oil you use is service interval. What's the Subaru service interval? 60K? These days Porsche is telling people 90k mi. That's a freaking joke. These are cars that people drive hard. This isn't your grandma's Buick. For a 100% street driven car I recommend a 20-30k mi service interval. For my street driven RS, I change it once a year, regardless of mileage.

For the one that we take to the track that interval is increased. Track use exponentially accelerates the breakdown on the gear oil. Obviously DE/open track days are a different sort of abuse than a 1 or 2 hour enduro event because how long the oil gets hot and stays hot (often Gearbox temps will approach or exceed 200 degrees in those circumstances). For DE/open trackday use, I recommend changing the oil after every 3rd or 4th event. If you actually race the car and do real timed race events where you are at the limit, I recommend changing it every 10-12 hours of track use. People are religous about engine oil service and many people change it after a single track day. You almost never seen them talk about changing their gear oil more often because they go to the track.

I think 95+% of the "results" people see with Scotty's mix is they are replacing worn out gear oil. It wouldn't matter if they put in Valvoline or Redline or Castrol at that point. If they put in fresh oil that is up to it's rated viscosity it's going to shift better.

In closing, put whatever you want in your gearbox. My street RS has Valvoline in it. My sometimes track RS has Mobil One Delvac. My Carrera has a speciality oil from a small company called Swepco in it. It's as good as the Delvac, but harder to get, and for whatever reason it works better with Porsche's old proprietary split ring synchros than anything else I've found. If I had a G50 with Borg Warner synchros in my Carrera, it would get the Mobile One like the Subaru. Just make sure it's at least 70w90 and GL5 and you'll be fine. Just change it more often than Subaru tells you to...
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Old 08-07-2010, 10:22 PM   #10
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Thank you, that clears it up.

I wasn't arguing or questioning you, just curious.
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Old 08-07-2010, 10:24 PM   #11
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Subaru recommends a 15K change of the diff and manual trans fluid in severe duty applications. I'm currently running Pennzoil bulk GL5 in both my trans and read diff, shifting is very smooth. I don't see why there are so many arguments about what to run when using the properly rated oil is all that's really necessary.
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Old 08-08-2010, 12:21 AM   #12
CALIBAN
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use Motul 300 75w90 gear oil. they work great for me.
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Old 08-08-2010, 12:30 PM   #13
MaxPower
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So any popular GL5 should be fine? Is synthetic required or is dino fine if I am going to change it often?

I've never heard of such frequent service intervals. Most of my life I have driven Volkswagens and have never changed gear oils. Thought because it was sealed that it wasn't subject to getting dirty and it doesn't break down. But it seems that now with the Subaru, I should for surely change them all out and continue doing it regularly? At least it's not a difficult job.

Are they like my VWs where I just add the oil until I can't add any more? Or is there a specific amount? As I said, my owners manual is in Japanese and I can't seem to find capacities anywhere on the web. Its just a standard 94 WRX with the EJ20G engine.
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Old 08-09-2010, 01:42 PM   #14
Matt Monson
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The gearbox itself is 3.7 qts. It's kind of a pain in the arse because you fill it through the dipstick tube. Get a really long skinny funnel and don't hurry.

The rear end takes .8 qts. It's like your VW with a drain and a fill plug. Always remove the fill plug before draining so that you know you can refill it. It uses a 1/2" square drive, with is a bit of a PITA. Just fill it up until it starts to leak out the hole.

I generally run my rear end twice as long as my gearbox and only change it once every 2 years.

One other thing to mention is you can ignore any discussions you see in the transmission forum about friction modifiyer. Neither of the LSDs in a stock configuration (center or rear) is a clutch type LSD. They are viscous and as such don't care about modifyers like a clutch style LSD does.
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Old 08-10-2010, 05:55 PM   #15
rob
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Matt, feel free to rip this appart, but from my experience, after you pick the GL and weight as listed by the manufacturer (GL5 in our case), it's a matter of finding the brand that matches the best to your particular synchros for smooth shifting.

For example for my old '88 Toyota All-Trac Celica, the proper GL5 Redline fluid caused problems with shifting, whereas Redline MT90 in my MR2SC shifts fantastically.

Since Matt recommended Mobil 1 Delvac I assume that it works well with our syncros.

I have gone so far as to put ATF in my '91 All-trac box to help solve a balkly 2nd gear upsift (and wow what an improvement it made). However it was understood that it wasn't GL5 rated and maybe not so good for the Hypoid gears.

-Rob
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Old 08-13-2010, 07:16 PM   #16
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I'm running 3Qts Redline Shockproof with 1Qt of Motul 300 75W-90. I tried this after reviewing some posts by Andrewtech. I have not had any issues, but will switching to one oil at my next change for the simple reason I don't want to futs with a blend, and quite frankly it seems odd to do this.

I also would like something that I can buy locally and not have to order, so it's good to hear feedback on the Delvac.
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Old 08-13-2010, 09:30 PM   #17
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I used Uncle Scotty's cocktail once and it was great for a few weeks. But it degraded quickly. Personally I think if you don't mix the lubes that it will be more consistent over time. But I can't really prove anything and just go by what my perception was of the cocktail.
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Old 08-16-2010, 02:11 PM   #18
sharp2whlz
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Default Mobil 1

I always used the Mobil 1 Delvac and it seemed to work great....smoother and quieter....but I think it had been neglected before I got it.
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Old 09-14-2010, 07:38 AM   #19
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I use OEM Subaru Extra-S Gear oil.... it definitely made a difference!
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Old 09-17-2010, 04:32 PM   #20
basel_520
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i like redline MTL 90, makes me happy. ive tried castrol 90w. MTL is alot smoother.
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Old 09-17-2010, 09:09 PM   #21
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I've used Uncle Scotty's transmission cocktail on a 94 WRX that I thought for sure the 2nd gear synchro would need to be replaced on, it cleared right up after I changed it. What was the change interval between the cocktail and the previous 75W-90 oil I used??? 2 weeks. Run what ever you like, don't trust what people say on the internet, get some real world experience and use what you find to work.
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Old 09-21-2010, 11:48 PM   #22
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Ok I'm a total noob when it comes to cars so don't get too frustrated... I learn as I go =P
I just imported a JDM 95 WRX and I need to change ALL of the fluids in the car. I guess I didn't think about the differentials in the car and didn't realize until today that the rear one needed a fluid. So am I correct in assuming that when you talk about the gear box oil, that is just the transmission fluid?
And I guess there is a drain and filler area for the rear differential, I hope I can find it heh. I hope I can find some photos but I'll probably be able to point it out and change it.

The car arrives on Thursday so I want to get things done slowly to it and make sure I do it right!

Thanks for the help!
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