Thread: GM Synchromesh
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Old 05-04-2017, 09:22 AM   #2 (permalink)
SouthArk370Z
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No lubricant that I know of is lifetime. They all get dirty and they all breakdown after a while.
Personally, 50k-60k miles is the most I would put on modern xmission fluid before changing. YMMV.

No idea about whether GMSM is OK in 370Z xmissions.
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