I went with OEM for ALL of my fork rebuilds and have never had one go bad, leak, tear, etc.
Just as the link tuning page says, for my MC28, I went with a 10/15W combo. Half and half to be exact and I was really like how it was handling for the track.
If you don't have a bushing/seal driver, a properly fitted piece of PVC pipe works just as well!
Dana
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2016 Husqvarna 701SM
2021 Husqvarna FS450 supermoto
2014 Honda CRF250R supermoto
1995 NSR250r MC28