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Old 01-14-2014, 06:32 PM   #1
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GL-4: Red Line Synthetic Oil - Gear Oil for Manual Transmissions - MT-90 75W90 GL-4 Gear Oil
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Old 04-02-2015, 04:55 PM   #2
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I'm with this guys, except that I blend 2 quarts of Red Line MT-90 with 1 quart of Red Line NS (Non-slip). Otherwise it is too slippery for my limited slip diff. to work well.
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Old 04-02-2015, 05:27 PM   #3
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My transaxle is a stock 6 sp. Do I have limited slip?
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Old 04-02-2015, 06:22 PM   #4
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My transaxle is a stock 6 sp. Do I have limited slip?
If it is a stock 6 speed then you do not have a limited slip differential. Our differential and transmission are combined as a "transaxle" and the differential and transmission share the same oil.
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Old 04-03-2015, 05:26 PM   #5
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Our differential and transmission are combined as a "transaxle" and the differential and transmission share the same oil.
This is what makes it such a difficult application. Most of the GL-5 oils that are great for differentials are corrosive to copper, and destroy the synchros.

The Porsche OEM stuff is quite good for this unique application, but my local dealer only buys it in 55 gal drums, and would not order me any.

The Red Line MT-90 is also very good, and synchro friendly. If you add in a Torsen type limited slip, it is just too slippery without blending.
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Old 07-14-2016, 07:17 PM   #6
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This what I use in my fake Diablo...Audi V8 w/ an Audi O1E 6sp transaxle from about 2006...the trans is Getrag and almost identical to that of a Boxster...but supposedly way stronger. Seems to work fine.
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Old 03-09-2021, 07:15 AM   #7
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Hi all, I just want to share my experience.
I bought my 2000S last year and a couple of months ago I changed the transmission oil to play safe and because the shifting was hard, it had a small leak too, I bougt "Total Dual 9 FE 75W-90" and after the first drive I started hearing a quick quick noise in Neutral which disappears immediately when I press the clutch or in gear and after some minutes of drive it also dissapears, the shifting improved but the little oil leak increased too...

I guess the oil was never changed (115.000kms) as it was quite dark with high viscosity.

Now I'm trying to get swepco 201 (general 80W-90) or Swepco 202 (75W-90 the better version as I checked on Swepco web page...)

I'm waiting for a local dealer to give me a budget for the arms seal and the IMS replacement (three weeks waiting already) but I'm thinking in chainging the transmission oil myself again just to stop the noise and any probable problem in the meanwhile.

Any suggestions on the oil? shell Shelix Spirax S6 ADME 75w-90
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Old 03-09-2021, 07:26 AM   #8
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Originally Posted by gpena View Post
Hi all, I just want to share my experience.
I bought my 2000S last year and a couple of months ago I changed the transmission oil to play safe and because the shifting was hard, it had a small leak too, I bougt "Total Dual 9 FE 75W-90" and after the first drive I started hearing a quick quick noise in Neutral which disappears immediately when I press the clutch or in gear and after some minutes of drive it also dissapears, the shifting improved but the little oil leak increased too...

I guess the oil was never changed (115.000kms) as it was quite dark with high viscosity.

Now I'm trying to get swepco 201 (general 80W-90) or Swepco 202 (75W-90 the better version as I checked on Swepco web page...)

I'm waiting for a local dealer to give me a budget for the arms seal and the IMS replacement (three weeks waiting already) but I'm thinking in chainging the transmission oil myself again just to stop the noise and any probable problem in the meanwhile.

Any suggestions on the oil? shell Shelix Spirax S6 ADME 75w-90
Use the factory oil.
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Old 03-10-2021, 06:11 AM   #9
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Use the factory oil.
+1 on using the Porsche 6 speed trans oil I went through what you are going through and JFP is right on. It’s expensive but it is the only one that worked for me.
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