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I will quote the very well-respected Steve Weiner from Rennsport Systems:
"Do NOT use a synthetic on your 915. [Synthetics like] Redline oils are very fine products and entirely appropriate for the later-model G-50's, but the baulk-ring syncromesh used in the 901-915-930 transmissions require a non synthetic oil to prevent excessive wear.
The very best product for these transmissions is Swepco.
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