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@Dutch_Cheese
Grease on the bolt or nut that tightens the crank arm on the spindler: yes
Grease on the sqare taper of crank arm or spindle: basically NO!
With the prescribed torque, the crank arm will slide too far over the spindle, leaving a permanent deformation of the crank arm's square taper.
Only exceptions where you can (or shall) use grease between spindle and arm: