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JFairman JFairman is offline
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Join Date: Jul 2006
Location: S. Florida
Posts: 7,274
If you have non synthetic oil in the transaxle you're right.

Synthetic oil is too slippery for the porsche steel synchro rings to grip and do their thing with their overengineered arrangement of stop blocks, anchor blocks, and energizer rings so you're supposed to use nonsynthetic GL5 oil in 901, 915, and 930 gearboxes.

The G50 and newer gearboxes with borg warner synchros work fine with GL5 synthetic oil.
Old 07-28-2010, 01:07 PM
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