What brand are you all using? I need to change a front seal
I've never heard of VI, is that somewhere on the bottle or do you have to find it else where?Fork oil is really all over the place when it comes to the engineering characteristics. Even simple things like the advertised viscosity can vary widely. A key characteristic is the viscosity index or VI. The VI measures how much the viscosity changes with temperature. A large VI is a good thing. It's amazing how different the VI can be. It can vary by a factor of three or more. In general synthetics are much better than non. There is also a general trend of it cost money to have a good VI.
Since shocks get so hot mot shock fluids have a large VI.
There is a giant chart with every suspension oil known to man. I'll have to see if I can dig it up.
Does that say crash formula