A lot of the problems with shimano brakes come down to their mineral oil viscosity. See here https://bicycles.stackexchange.com/questions/65337/what-causes-and-how-to-fix-wandering-bite-point-on-shimano-hydraulic-brakes
I'll be changing my 8100s to putoline on the next bleed.
Presumably Putoline has an additive to make it consistent in cold weather?
@Dogs started
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A lot of the problems with shimano brakes come down to their mineral oil viscosity. See here https://bicycles.stackexchange.com/questions/65337/what-causes-and-how-to-fix-wandering-bite-point-on-shimano-hydraulic-brakes
I'll be changing my 8100s to putoline on the next bleed.