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@wheels
A bit of a contentious subject with good arguments for both sides, but after a lot of research and a lot of reading over the years I now always grease the taper on ISO and JIS square tapers, and then crank it down with a well calibrated torque wrench (I do this once only, none of this tightening and then retightening after a hard ride carry on) - the result has been not one single problem with getting the cranks arms on/off and I have never had an arm loosen or the square receiving hole deform over the last ten years or so.
. . . but I don't doubt there are people who don't grease the taper flats and don't use a torque wrench and have also had no problems.