Heen
Barefooter
Art, depending on the oil, they do degrade. Mineral oils are effected more then synthetics because they are not as uniform and do not handle heat as well as synthetic oil. Usually more important it is there is any degradation of the additive package in the oil. One possible example that is outside of my area of knowledge could be if fork oils have EP additive that could be important in reducing damage in bushing when the bike is ridden hard.
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