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3rd_gear_Ted 3rd_gear_Ted is online now
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Join Date: Oct 2007
Location: SoCal
Posts: 5,212
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What ever oil you choose for your 915 is a compromise; the ring gear wants slippery, the synchros don't like slippery.

For my track only use 915, I want the ease of shifting during racing along with the the optimal operating condition for the LSD and consider the ring gear a wear item to be replaced within a couple years anyway.

For that reason, Redline was my sentimental choice, same oil as specified for my "back in the day" T-10 Muncie gearbox on a Chevy Z-28 I once street raced with that had over 400+ HP.
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1980 911 - Metzger 3.6L
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Last edited by 3rd_gear_Ted; 05-22-2017 at 10:01 AM..
Old 05-22-2017, 09:59 AM
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