I prefer that the chain is the same make as the derailleur for performance reasons. Obviously the derailleur and shifter need to be the same (12s SRAM or 11/10s Shimano and compatible) but the Deore, SLX, XT, XTR cassette is still the best in the business. Chainring is a variable, cranks do not...
Power supply missing from the battery to the motor. The display has its own rechargable battery and is plugged into the lever. Best option is going to be a certified Bosch Tech who can take a look at it and put it up on the diagnostic tool.
The Royal Blood is a very very light mineral oil that Magura uses, but its specific properties are proprietary and a secret. I have used ‘other’ oils to help a rider out of a jam but warned them that a complete bleed would be necessary after they get back home from vacation. As far as rider feel...
Most of my customers are getting about 1200km per chain the most I have seen is 1559 per and the least is 148kms. Mostly mid-level Shimano (Deore and up) conditions run from clean and dry pavement (148kms!!!) to crushed gravel, flat-ish under a 160lb rider who spins (1559kms). At 1200 I’ll...