Very quickly and simplistically, altering viscosity primarily affects by pass bleed ( clicker positions ) by about 95% and will affect flow through deflected shim stacks by only about 5%. If you have made a substanial change in viscosity you may have to move the clicker setting by an enormous and ''inappropriate amount'' Excepting on a limited number of top shelf suspension components the tapers on adjustment clicker needles only have a single taper and therefore dont have a linear response range. There is a sweet spot of response range. If you are only a few clicks out from ''fully in'' one click can be a huge change ( excepting if the shim stack opening pressure is very weak ) Conversely, if you are nearly all the way out, one click will do almost nothing as the needle is already so far withdrawn.
So tuning by viscosity is in most ways a myth, especially with modern high spec high performance suspension units.
And not all oils are the same, sae ratings are not ''gospel'' by any means. But please ask me about that another time or read an upcoming issue of Kiwi Rider. I need sleep!
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