I'm asking these things in part because I just replaced the shock on my m/c, and took the forks off for a rebuild and fluid change. Peterverdone is also a really good source for explanations of suspension tech. There is an article up on my site about it that goes more in depth on the subject if you want to look into it. I'm sure there are other things, but that is all I can think of at the moment. A high VI certainly doesn't hurt but it isn't at critical as it is in a shock oil.Īnti-foam is crucial for both fluids since foam destroys the damping ability of the fluid. There is more contact area and higher side loads on forks then on a rear shock so anti-wear and frictional properties are a bigger priority in fork oils then shock oil. Because of the relatively excessive heat, the rear shock fluid needs to have high oxidative stability to prolong fluid life. So rear shock oils need a higher VI to avoid excessive fade as they heat up. Forks usually stay below 100F in mild ambient temperatures.
Rear shocks generally have a bigger temperature swing going up around 150F at times. Here's what I at least think are the facts. I'm no expert on shocks, but I do know the fluids pretty well.
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