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Insulation's role in overheating a 'myth' - building experts
(www.rnz.co.nz)
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As long as the bearings are maintained, motors that don't experience shock loading can run for a long time.
I remember a motor that had no maintenance done on it in 2 years, it only failed due to the dust build up causing it to overheat. That is ~17500 hrs of running, without any maintenance at all.