Originally Posted by DSM8
If you have mineral oil then it is just a good idea to flush and refill.
You can prolly mix diff fork oil if you had too but I would try to keep stuff in the same family. ATF, Mineral, Fork etc etc
It's all mineral oil, just with different additive packages. ATF and fork oil are actually designed to be lubricants, whereas mineral oil from the drug store-
not so much.