I decided to drain the front forks.and refill with hydraulic 20wt. (Power steering fluid). Going on short test rides there was a "not smooth" clunkyness. Took off the small screw at bottom of fork and started taking off the cap nut(bolt?) To drain faster and to refil. But the "cap" had a rod inside which started to come up with the cap; and something said "stop" until you find out. The oil that has dripped out already looks very thick and as if it's been in there since the last century, so not a bad idea to drain and replace, but just trying to be cautious.