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Old 01-03-2002, 04:38 PM   #1
aov
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Default Called Redline about MT oil

My local shop called Redline for me to see what transmission oil would work with the WRX and they recommended the MT90.

My syncros didn't like the Mobil1 75W90 and he figured that was because they use friction modifier, and its too heavy for our transmissions.

(Not sure what the difference is between the Redline MT90 and the 75W90NS is, but Redline recommended the MT90.)

Just thought I'd pass it along.

-anders
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Old 01-03-2002, 04:40 PM   #2
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Would that be just for the Tranny or is it also for the diff as well.
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Old 01-03-2002, 04:49 PM   #3
aov
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Front or Rear? Not sure, but I would think it would be best to use the same in both. I have heard other people have problems with the Mobile1 in the MT, but not in the rear diff. I am going to keep mine for now, but will probably change to Redline next time.

-anders
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Old 01-03-2002, 05:31 PM   #4
mhbrown
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I happened to have Redline's web site open. Here what they say about the products we should be using:

75W90 Gear Oil - the preferred product in nearly all car and light truck differentials, both conventional and limited-slip. 75W90 is preferred for most racing applications. It contains friction modifier which is recommended for limited-slip units. 75W90 Gear Oil can be used in many transmissions and transaxles; however, other Red Line lubricants have better frictional properties for rapid synchronization. Exceeds API GL-5.

MT 90 - Manual Transmission/Transaxle Lubricant. A 75W90 GL-4 gear oil which is designed for manual transmissions which require 75W90, or 90 GL-4 gear oils or motor oils. Uses the same chemistry as MTL , but is a 90 WT in order to satisfy certain manufacturers which recommend SAE 90 GL-4 gear oils.

Also take a look at:

http://www.cobbtuning.com/tech/gearoil/index.html
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Old 01-03-2002, 05:33 PM   #5
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Redline MT90 is a GL-4 oil.

You need a GL-5 oil - check your handbook. Redline 75W90 or 75W90NS works fine; NS is a little better for the transmission, 75W90 is better for the rear diff.

Glenn
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Old 01-03-2002, 07:05 PM   #6
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The factory uses and recommends 75W90 GL-5. The reason for using Redline 75W90 NS is that the NS does not have the friction modifiers that their regular 75W90 does. The friction modifiers will not allow the synchros in the trans to work properly.
As for the limited-slip ours are sealed viscous-type units and the lubricant does not affect them.
If I am not mistaken the 75W90NS can be used in the rear differential as well as the trans/center.
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Old 01-03-2002, 08:52 PM   #7
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I called and talked to Dave Granquist at Redline, he is their tech guru over there. As soon as I mentioned that the factory required GL-5, he immediatly said 75W90NS from the trans. I asked about MT90 and MTL, he said they are both GL-4 and when the manufacturer calls for a GL-5 in the trans, use it... simple as that. He didn't seem to know a whole lot about the trans, since it also shares fluid with the front diff. The need for GL-5 may stem from that. He also said straight 75W90 for the rear diff, wheter it has an LSD or not. So, from Redline's recommendation and the fact of saving my 6/60 powertrain warranty... I will use 75W90NS.
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Old 01-03-2002, 10:03 PM   #8
aov
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Thanks for all the info guys. That really helps.

From the Cobb site I figured MT-90 was still an OK choice, but seeing that that it is GL4 I'll return the stuff I have and get 75W90NS.

Thanks,

-anders
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Old 01-04-2002, 12:07 AM   #9
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Yep I know the VC's are sealed and that the friction modifiers are unneccesary in both ends.

If you read their site a bit you'll see Redline recommends the 75W90 for hypoid bevel ring/pinions (or maybe it was on something printed I got) hence it being suggested for the rear diff.

The 75W90NS will also work fine in the rear diff.
75W90 will also work fine in the trans.

But it is "slightly" preferable the other way round.

Glenn
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Old 01-05-2002, 05:42 PM   #10
aov
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Well, I changed to Redline 75W90NS yesterday and the shifting is much better than with the Mobil1, it shifts they engage much smoother now. So far I have had no problems with the syncros either.

-anders
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Old 01-06-2002, 09:15 PM   #11
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Excellent... glad to see you had good results. I still have a couple thousand miles before my change... already got the oil though 1 quick question... do you have the often feared, never understood decel trans noise? I have yet to hear this in my car (MY02 RS... not a WRX), just normal gear backlash when you get off the throttle. If you did have the noise... did the Redline by any chance lessen or eliminate the noise? Did it make any more noise? I don't know why I am asking this... I'll just say "For the good of Impreza owners everywhere!"
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Old 01-13-2002, 03:10 PM   #12
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I have done the change to Redline and noise from the trans is greatly reduced.
Check this thread in Transmissions:
http://www.impreza-rs.com/forums/sho...062efad51a662b
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Old 01-13-2002, 03:13 PM   #13
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Your thread doesn't appear to be working.
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Old 01-13-2002, 03:19 PM   #14
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Old 01-13-2002, 03:22 PM   #15
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Thumbs up

Good to go.
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Old 01-30-2002, 07:34 PM   #16
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Default What's the capacity of the rear diff?

Hey Everyone,

I want to replace the tranny and rear diff fluid in my 02 WRX wagon with Redline but need to know the capacities. Anybody have that info handy?

Thanks!
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Old 01-31-2002, 12:47 PM   #17
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Default Re: What's the capacity of the rear diff?

Quote:
Originally posted by vr4_for_fun
Hey Everyone,

I want to replace the tranny and rear diff fluid in my 02 WRX wagon with Redline but need to know the capacities. Anybody have that info handy?

Thanks!
Check the owners manual. I don't have the info, but I know it's in there.
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Old 01-31-2002, 01:32 PM   #18
vr4_for_fun
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Default Rear Diff capacity is not in the owners manual

Hi,

I checked the owners manual and it tells you the tranny holds 3.7 qt.s but it never mentions the capacity of the rear diff. Anyone know what that is so I can order the right amount of Redline fluid for it?

Thanks!
Randy
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Old 01-31-2002, 05:54 PM   #19
Mean
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My 97 Impreza Wagon holds 0.8 qts in the rear diff. Took a quick look and they appear to be about the same size. The 97 tranny holds 3.7 qts too so it makes sense.

Order 5 qts and you will have a little extra.

Mean
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Old 01-31-2002, 06:04 PM   #20
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Default Thanks!

Thanks for the info....
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Old 02-05-2002, 12:28 PM   #21
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Default Mobil 1

Ya, I also had cold weather syncro problems with Mobil 1 in my '93 Toyota Corolla wagon. I am going to try 75W90NS in it also!!
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Old 02-05-2002, 02:15 PM   #22
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Lightbulb Capacity of rear differential

It holds 0.7 quarts. It is impossible to overfill, but quite tricky to fill at all!
I put Redline 75/90NS in the tranny and 75/90 in the rear differential a couple of weeks ago. So far no grinding! Deceleration noise is still there, although it's not too noticeable if I keep 3-4 more pounds of air pressure in my front tires than in the back.
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Old 02-05-2002, 04:08 PM   #23
donrgolf
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I changed to Redline with good results. 75W90NS in the trans and 75W90 in the diff. Very helpful tip: Get a hand held siphon pump of some kind to fill the diff. No room to pour it in
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Old 02-07-2002, 02:15 PM   #24
zemmo
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Whattaya think about using the Redline Lightweight Gear Oil in the transmission? My WRX owners' manual doesn't specify 75W90, it shows the ambient temp. range over which each viscosity can be used. The LGO is 75W80, GL-5, and should be fine for the upper end of temperatures where I live, while working better in the deep cold of winter.
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Old 02-08-2002, 02:07 AM   #25
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What do you think you're going to gain, and what are you risking?

Most people have had success with 75W90.
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