4 gear seems to last longer. less gears = less switching= less slipping on changing =less wear= less debris in oil=less blocked filters=more stable oil pressure=less slipping=less wear to clutches. Hope that makes sense. Anyway boxes are not bad if serviced. What causes failures is debris clogging filters not just the main one but also small wire mesh filters which reduces oil flow and pressure and causes clutch slipping which in turn makes more wear and debris.
I was going to run mine to the ground and then do a manual conversion but now having second thoughts. I might give it a good service, not just oil change but remove solenoid/valve block and give all good clean making sure all filters are clean. It is still working fine just a bit slow/lazy when cold. By the way it is 1997 S8 DYM gearbox 130k no record of being serviced
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