Originally Posted by
wheelhaus
Since emulsion shocks allow the air to mix (emulsify) with the oil, the two mediums (air & oil) cause the mixture to become lighter/thinner than the measured oil weight.
Originally Posted by
vwduud
Also suggested is that the added air slightly dilutes the oil, reducing its effective viscosity.
Over the years I've noticed that people consistently neglect this when claiming they've tried bladder VS emulsion "back to back". Truly I'm agnostic on the subject, but it's possible that those who liked emulsion better over bladder merely needed thinner oil on their setup to begin with (or vice versa).