eBike motor maintenance

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JackStraw

Active Member
Hi,
Is there a way to tell that he ebike motor is up for a maintenance?
Is this something that should be done every two years or are there any other indicators?
In my case it is Bosch Active Plus
I don't see there is any play yet but wonder what is the optimal resistance from the motor when you pedal in the opposite direction to tell that the bearings need greasing?
Thank you
 
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