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Fritz-
I cleaned out the internals of some 1973 vintage open twin tube Koni inserts and used Amsoil medium weight shock oil on the refill (10 weight). I filled the internal cylinder completely and went up to half way in the outer housing level. You'll need less than a quart for two inserts. The outer housing level I used was a guess based on a graphic from the Koni website that showed how their twin-tube hydraulic shocks work.
One was leaking so I replaced both with red Koni special inserts rather than attempting to replace O rings, shaft packing etc. The ride was much better with the open inserts than with the KYB junk I replaced.
Good Luck,
Jim
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