You can go higher than spec. From the wiki:
"Start with 200mm of fork oil level. Try to bottom with hard braking, hitting sharp bumps, and cornering hard. If you don't bottom, it's not a worry. If you bottom the forks, add 10ml to each leg and try again (or measure 5mm more oil; it should be close to the same). Keep doing this until you bottom on intentional maneuvers, but don't often bottom in daily riding. The goal is to use as much of the suspension travel as possible, as much of the time as possible. If you don't bottom out though, or even get close... then there's too much oil. "
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