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View Poll Results: Which gear oil?
Redline MT-90 75W90 GL-4 3 30.00%
Redline 75W90NS GL-5 7 70.00%
Voters: 10. You may not vote on this poll

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Old 09-19-2006, 01:46 AM   #1
Scooby Newbie
Member#: 57407
Join Date: Mar 2004
Chapter/Region: South East
Location: Florida
1983 02WRX & 14BRZ

Question 02 WRX Redline MT90 vs. Redline 75W90NS?

Car: 2002 WRX 60,000 miles
Current Gear Oil: Motul Synthetic 75W90 GL-5
Have waiting: Redline Synthetic MT90 75W90 GL-4

I ordered 4 quarts of Redline 75W90NS and I was accidentally sent Redline MT90 75W90. I have read the sticky by Rallispec mentioning that the GL-4 is actually better for the synchros, however I have read the other sticky mentioning that the 75W90NS is being run by more people with somewhat mixed results. Coming from a synthetic GL-5 to a synthetic GL-4, would there be any problems? The MT90 can be sent back for the 75W90NS without a problem, but I'm wondering if I should just stay with the MT90.

Your thoughts.

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Old 09-19-2006, 07:26 AM   #2
Scooby Guru
Member#: 22412
Join Date: Aug 2002
Chapter/Region: SWIC
Location: Albuquerque, NM
2012 Legacy 2.5GT
Ice Silver Metallic


Subaru specifies a GL-5 rated lubricant - I would be reluctant to put 100% GL-4 in there... maybe a mixture, but not all GL-4.
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Old 09-19-2006, 12:43 PM   #3
Samurai Jack
Scooby Guru
Member#: 21145
Join Date: Jul 2002
Chapter/Region: NESIC
Location: Not in my own time
2002 Enemy of Aku


Even though Subaru specs GL5, check with Andrew @ AndrewTechAutomotive (I think I spelled that right). Last I had seen, Andrew recommends straight Redline Lightweight Shockproof, a GL-4. Says that has the best results.

I run a mix of Redline 75W90NS and Lightweight Shockproof, more or less 50/50. I like it better than straight 75W90NS but I haven't tried straight Lightweight Shockproof.

I find shifting smoother w/the 50/50 mix as opposed to straight 75W90NS.
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Old 09-19-2006, 01:47 PM   #4
Scooby Newbie
Member#: 42329
Join Date: Aug 2003
Chapter/Region: Tri-State
Location: Boyertown, Pa
2002 WRX sedan


At my first change, I put in MT 90 because that was what was recommended on Cobb's site. I was worried about the GL-4 rating, so after ~30,000, I switched to 75W90NS, as recommended by Redline.

Frankly, I was happy with the performance of both products. Shifting was better, especially cold, than with the stock lube. Getting into 1st gear at a roll was/is not possible, though.

After a months' long quest, I now have the ingredients for Uncle Scotty's cocktail, which goes in next.

My 2002 has 92,000 miles on it.
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Old 09-19-2006, 01:58 PM   #5
Scooby Newbie
Member#: 57407
Join Date: Mar 2004
Chapter/Region: South East
Location: Florida
1983 02WRX & 14BRZ


Thanks RayO, I just saw that on the Cobb site.
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