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Old 05-31-2014, 03:27 PM   #1
InTheBurbs_of_Chi
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Default Recommend Transmission Oil / Rear Diff Oil

I have an 04 WRX with a 5MT. I'm getting ready to do a trans and rear diff oil flush and am in need of some recommendations for oil.
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Old 05-31-2014, 04:29 PM   #2
Bikelok
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Ok, I'll be nice as its very apparent you did not even think of searching this.

The 5 speeds are very picky about what goes in them. The main fluids of choice are:
Subaru Extra-S
Uncle Scotty's Cocktail
Andrewtech Cocktail
Grimspeed cocktail

There are others but these are the main ones.

The rear end is not picky.

Now, its up to you to search what these are as there is LOADS of info out there.

Also in the future, if the people on here think you have not searched yourself, you will be torched!
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Old 05-31-2014, 05:27 PM   #3
InTheBurbs_of_Chi
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Yeah I'll admit I didn't search it. I was at work and didn't have time to sift through threads and was in need of quick answer

Thanks for not being a d*ck about it lol. And I appreciate the suggestions also
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Old 05-31-2014, 07:00 PM   #4
DONx3
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I used Motul Gear300 75W90 for both.
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Old 05-31-2014, 07:03 PM   #5
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I've only ever used Redline for tranny and diff
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Old 05-31-2014, 07:45 PM   #6
InTheBurbs_of_Chi
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Can redline be bought in store? I've seen people say they've used in other threads now that I've had time to research this a little but it seems like that stuff is kinda special
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Old 05-31-2014, 09:46 PM   #7
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Most auto parts stores will carry it.
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Old 05-31-2014, 10:15 PM   #8
InTheBurbs_of_Chi
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Huh, ok cool. Thanks for info. I see you're from canada, I hope that's the case for me but I'll take your word for it
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Old 05-31-2014, 11:05 PM   #9
Andrewxxcarlson
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Nothing synthetic, nothing limited-slip.
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Old 06-01-2014, 01:19 AM   #10
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Quote:
Originally Posted by InTheBurbs_of_Chi View Post
Can redline be bought in store?
go to their website (www.redlineoil.com) and use the dealer search to see if there is someone local that carries it. You'll want the 75W90 NS
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Old 06-01-2014, 01:22 AM   #11
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Quote:
Originally Posted by Andrewxxcarlson View Post
Nothing synthetic
That's just bad info. There are a number of synthetics that work well - Motul Gear 300, Redline 75W90NS, etc. - as well as some that folks have had trouble with (Mobil 1, Royal Purple, etc.) - do your research, and use one that's been proven effective in Subaru MTs and you'll be fine.
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Old 06-01-2014, 02:06 AM   #12
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Personally I don't like mixing oils. I don't believe in any of the cocktails. Some are high in sodium. Causing damage to items like syncros. Check out Uncle Scotty's cocktail and Blackstone lab oil test. Uncle scotty and I got in to it a few times in the distant past.

I tried the Motul Gear 300. It was very notchy. I got a free sample from Motul at a show. Nice guy but I just don't like the gear oil. I ran it for several months before I simply couldn't stand it any more. Yet this oil I hear works good in the 6 speed.

I tried Redline 75w90 NS I had it for I think 3 days before it ate my early 3pc. 02 3rd gear syncro. I was pissed. As I only did a light down shift. I thought I was using a quality oil. Turns out this was relatively common.

My go to oil for any 5 speed suby trans is Redline Lightweight Shockproof. It has no weight listed. It's estimated 75w120. It's blue. It works so good I can slip gears all though out the gear range. I haven't had any syncro problems since using this oil.

My driving: I drive stupid hard and broken a lot of parts over the last 200k.

There is a lot of talk about what gear oil to use. I suggest make up your own mind and try some of the best choices.
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Old 06-01-2014, 03:25 AM   #13
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Hmm well there seems to be a lot of opinions here... Interesting
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Old 06-01-2014, 04:01 AM   #14
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Quote:
Originally Posted by InTheBurbs_of_Chi View Post
Hmm well there seems to be a lot of opinions here... Interesting
Do your research, make up your own mind.

Also, don't be turned off by cocktails, but if you want to keep it simple then go with either Subaru Extra-S, or Redline heavyweight shockproof. The lightweight shockproof wears too quick.

Personally I've been running Uncle Scotty's Cocktail the past 2 years. I'm very happy with how it works and I'm not worried about how it might affect the syncros in the least.

Again do your research and make your own mind up.
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Old 06-01-2014, 12:48 PM   #15
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Mobil Delvac 75w90 should be on list for tranny fluid. It does not have the limited slip additives found in the auto part stores Mobil 1 LS. Order online: http://www.lufteknic.com/Merchant2/m...bil75-90delvac

Rear diff you can use Mobil 1 LS or Valvoline LS 75w90 found in auto part stores.
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Old 06-01-2014, 03:11 PM   #16
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Jump online and get some MOTUL 300 Ester based 75w90 gear oil.
GL-5 Hypoid. I run it in my own car & recommend it for any high-performance application.
I am a Subaru Tech and stand by it!
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Old 06-01-2014, 03:14 PM   #17
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IAG sells it, or you can try Amazon.
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Old 06-02-2014, 09:14 AM   #18
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Quote:
Originally Posted by lotarg View Post
Mobil Delvac 75w90 should be on list for tranny fluid. It does not have the limited slip additives found in the auto part stores Mobil 1 LS. Order online: http://www.lufteknic.com/Merchant2/m...bil75-90delvac

Rear diff you can use Mobil 1 LS or Valvoline LS 75w90 found in auto part stores.
+1 on the Mobil Delvac 75w-90 and M1 LS in the rear diff.
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Old 06-02-2014, 09:20 AM   #19
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I have used Subaru Extra-S. It's great. Before I was unable to shift into first unless at a complete STOP. After the change, I can get into first at low speeds fine...
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Old 06-02-2014, 01:12 PM   #20
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I asked the same question (although my car is '00 impreza 2.2 NA) - might be of interest:

http://forums.nasioc.com/forums/show....php?t=2633312

One thing everyone seems to agree on is that you need GL-5 oil without the friction modifier additive for limited slip differentials.
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Old 06-03-2014, 04:52 PM   #21
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Mobil 1 Delvac is in there now; cold it's absolutely phenomenal but once it warms up I can't stand the shifting.

Redline seems to be where it's at after doing a little research.

Thanks for all the input fellas!!
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Old 06-04-2014, 07:32 PM   #22
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Mark at APM in Villa Park would be a good resource for you. Fluids, mods, tuning, maintenance.
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Old 06-04-2014, 08:58 PM   #23
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Quote:
Originally Posted by hybrid gti 2 View Post
Personally I don't like mixing oils. I don't believe in any of the cocktails. Some are high in sodium. Causing damage to items like syncros. Check out Uncle Scotty's cocktail and Blackstone lab oil test. Uncle scotty and I got in to it a few times in the distant past.

I tried the Motul Gear 300. It was very notchy. I got a free sample from Motul at a show. Nice guy but I just don't like the gear oil. I ran it for several months before I simply couldn't stand it any more. Yet this oil I hear works good in the 6 speed.

I tried Redline 75w90 NS I had it for I think 3 days before it ate my early 3pc. 02 3rd gear syncro. I was pissed. As I only did a light down shift. I thought I was using a quality oil. Turns out this was relatively common.

My go to oil for any 5 speed suby trans is Redline Lightweight Shockproof. It has no weight listed. It's estimated 75w120. It's blue. It works so good I can slip gears all though out the gear range. I haven't had any syncro problems since using this oil.

My driving: I drive stupid hard and broken a lot of parts over the last 200k.

There is a lot of talk about what gear oil to use. I suggest make up your own mind and try some of the best choices.


and all that is STILL bull****

there is ZERO proof that any of the ingredients in the 'cocktail' are in any way harmful to any transmission component

MY car now has 130k on it and it still going just fine and had the 'cocktail...the v3 cocktail in it since about 4k miles

there are MILLIONS of miles of 'cocktail' use out there since 2003 and NOTHING points it causing ANY failures.

NOTHING....ZERO evidence of ANY failures caused by its use.

now...there are idiots with broke dick transmissions putting it in thinking its some magic cure for a broke dick transmission....WHICH IT NEVER WAS AND IS NOT

99% of transmission failures are idiots behing the wheel......


and the one UOA that was done on the lube that came out of a transmission that ALREADY HAD 250K MILES ON IT

give me a ****ing break
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Old 06-05-2014, 12:08 PM   #24
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Quote:
Originally Posted by Uncle Scotty View Post




give me a ****ing break
*gives scotty a kit kat bar*

And doesnt your wife tell you that rolling your eyes is unattractive?! Lol.
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Old 06-05-2014, 12:24 PM   #25
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Quote:
Originally Posted by Scoobiesdoobies View Post
*gives scotty a kit kat bar* And doesnt your wife tell you that rolling your eyes is unattractive?! Lol.
Scotty...wife'd up? Nawwww. Bachelor for life.
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