I have had very good results with MT-90 over the years as well. However the Redline folks suggested to me that the best match for the Boxster S transaxle was their 75W90NS (non-slip) oil. I've had it in for about a year with no complaints. Some people, especially owners with B+M shifters, prefer the Redline "cocktail" which mixes the 75W90NS and Light Gear oil.
Well, the MT-90 is a GL-4 fluid, while the 75W90 is a GL-5. The question then, obviously, is does the 6-speed box in the S have any yellow metal in it to worry about?
Dont forget you have to remove the metal rock sheild under the tranny and you will need a Pry bar to get the diagonal braces and rock shield to pop off.
Speaking of pry bars... Has anyone had trouble getting the plate and braces to line up when going back on?
Yeah I did. Just talk your palms and push the darn thing up as hard as you can. It should go on.
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-99' Zenith Blue 5-spd...didn't agree with a center divider on the freeway
-01' S Orient Red Metallic 6-spd...money pit...sold to buy a house
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