Outer fluid doesn't do much more than lubricate the seal lip and bushings. Viscosity is of no real concern.
From what I recall the OEM fluid is Marzocchi 7.5wt. This oil is rated at 26.1 cSt@40C/5.25 cSt@100C/VI 150.
I always used the same oil I always use in everything which is 15.9 Viscosity @ 40?C, cSt, and 4.4@100... VI 209.
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