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Opinions vary on fork oil capacity/grade. It depends on the forks. About 200cc ish and 10ish weight might be a starting point. Ming's technical chart suggests that's about right
For example see:
viewtopic.php?f=4&t=2054&hilit=fork+oil+grade

Forkoil more or less 200ccm in each leg. I normaly use SAE 15 (and found out that with old drumbrakeforks from Pailoli to me the SAE 15 was a bit too hard). Other people prefer SAE 10 en general

Did mine last week.I used 220mL of 15Wt oil per leg in my 83 K1 as usual. Interestingly one leg produced lovely clean oil and the other produced a filthy grim looking liquid. I run gaiters on the stanchions. Must be something degrading I guess.
Speaking of filthy looking grim liquid a bar down the road is doing American Imperial Stout at 10.5%. If you like Rocky Road it’s delicious.

3potjohn wrote:Did mine last week.I used 220mL of 15Wt oil per leg in my 83 K1 as usual. Interestingly one leg produced lovely clean oil and the other produced a filthy grim looking liquid. I run gaiters on the stanchions. Must be something degrading I guess.
Speaking of filthy looking grim liquid a bar down the road is doing American Imperial Stout at 10.5%. If you like Rocky Road it’s delicious.

Is the American Imperial Stout the same thickness as the fork oil?

Probably a bit thick with too much of a damping effect.. The 7% one might be better considering.
John