The Zoke 7.5wt oil is 26.1 cst @ 40c. Any oil, regardless of claimed weight, with a similar cst@40 rating will perform like the original fork oil.
Full specs are...
Marzocchi 7.5wt fork oil
26.1 cst @ 40c
5.25 cst @ 100c
150 viscosity index (reported)
135 viscosity index (recalculated)
0.80 viscosity temperature coefficient
4.97 VT (cst@40/cst@100)
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