I have K-tech fork-springs and Razor-R rear shock on my race bike. I change fork-oil in winter between seasons (about 50 days @ track per year). I could probably go 2 seasons per change as the rate of decay is not very quick.
Factory fork-oil is 15w and rebound-holes in damping rod is designed for that. If you have stiffer springs than stock, heavier oil should used. Especially if you use more oil volume (less air) than stock as this adds to "springiness". I use 0.85k springs and settled on 17.5w oil.
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