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Old 07-23-2003, 06:58 AM   #1
Barry
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Default Tranny Cocktail

First off, I have never experienced any grinding at all. But I am not a fan of the notchy gearchanges in our cars. Due to the many problems people have encountered I have avoided the switch to synthetic gear oil. I have changed fluid every 15-20k at my dealer. They use Agip lubricants. Last week I had my fluid changed and decided to add a quart of Red Line MT-90 to the tranny. No grinding at all and all notchiness has disappeared. I highly recommend this cocktail to all of you who are caught between "synthetic or non-synthetic" for your gearbox.
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Old 09-24-2003, 05:08 PM   #2
03WRXMA
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Hows this been going for you?

-dave
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Old 09-25-2003, 01:45 AM   #3
wolf8314
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I just changed my gear oil. I used Molbil 1 synthetic, awesome, completely changed the way my car shifted.
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Old 10-10-2003, 04:48 PM   #4
zoomfactor
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Since we're talking cocktails...

I just topped off my fluid with Lucas oil additive at the suggestion of an old racer. It seems to "stick" to the gears and it has dramatically improved the feel of the shifter.
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Old 10-11-2003, 12:54 AM   #5
04EJ20
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I heard the MT-90 is a GL4 which will corrode the copper syncros. Our boxes need GL5's...
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Old 10-11-2003, 09:58 AM   #6
Barry
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Quote:
Originally posted by 03WRXMA
Hows this been going for you?

-dave
8.2k miles with no problems

over 59k miles on the car........yup, I love to drive..........
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Old 10-11-2003, 11:56 PM   #7
AdmireWantWillLove
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This could be all in my head but my car is coming up on 10,000 miles and the shifter does not seem as smooth as it used to be.

I have the OEM short shift. Is there anything I can do now to help with it feeling a little more smooth? Should I get new bushings? Is it too early to change my fluid?

Thanks
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Old 10-12-2003, 10:00 AM   #8
SidneyWRX
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I had stock tranny fluid in my rex for about 27K miles. Switched to Mobil1 for about 4K miles and my 4th gear synchro started to slip. I switched to Redline lightweight shockproof and had it in for almost 5K miles and haven't had any problems. Slip is gone, all is good! I have the OEM short shifter and changed to kartboy shifter bushings and love it. Go for it.
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Old 10-12-2003, 11:29 PM   #9
drees
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Quote:
Originally posted by 04EJ20
I heard the MT-90 is a GL4 which will corrode the copper syncros. Our boxes need GL5's...
Here's the real story on tranny fluids.

GL4 fluids have been used for ages in manual trannies. Why? Because they work great with synchros!

GL5 fluid on the other hand was once known as a fluid which would eat the brass/copper in synchros. Why? Because of the extra EP (Extreme Protection) additives required to gain GL5 status.

However, modern GL5 fluids are much better in this regard and are no longer as bad for synchros as they used to be, especially synthetics.
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Old 10-12-2003, 11:51 PM   #10
04EJ20
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Quote:
Originally posted by drees

Here's the real story on tranny fluids.

GL4 fluids have been used for ages in manual trannies. Why? Because they work great with synchros!

GL5 fluid on the other hand was once known as a fluid which would eat the brass/copper in synchros. Why? Because of the extra EP (Extreme Protection) additives required to gain GL5 status.

However, modern GL5 fluids are much better in this regard and are no longer as bad for synchros as they used to be, especially synthetics.
Oh hell! I'm going back to ShockProof like I used in my Jetta. It was the best stuff I've ever used and this grinding in my Rex has got to go!!!

Thanks for the info Drees!
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Old 01-21-2004, 09:28 PM   #11
03WRXMA
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Bump^ for the great info.

And I want another review... since its cooooooold out now...

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Old 01-22-2004, 03:43 AM   #12
Barry
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Quote:
Originally posted by 03WRXMA
Bump^ for the great info.

And I want another review... since its cooooooold out now...

Dave- Still working just fine.......14k miles. Cold weather shifting continues to be better than OE fluid only........might actually go 2 qts. MT-90/ 1.7 OE on next change. Read where some folks have gone straight MT-90 and love it

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Old 01-22-2004, 07:42 PM   #13
Conduit
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MBP, 1st WRX Ever in FL.

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Old 01-22-2004, 10:59 PM   #14
Aspen_2.5RS
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Default

I'm getting a grinding in 2nd. I just changed from Coastal 75W90 to Redline 75W90NS and it's still doing it.

I've heard one bad thing about Lucas oil stabilizer and one good thing. One guy said it eliminated his grinding all together and the other guy said "if you want to f up your tranny go right ahead".

Also when I drained the fluid there was a chunk of metal on the plug. So I guess I just wasted $40 on new fluid for it.

Cam
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