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I'd steer clear of the SAE viscosity classifications since those are a range.
Golden Spectro 85/150 is a 9cst to 16cst oil which is pretty heavy and equates to a Fox 1`10W.
Also viscosity does not blend linearly so mixing 50% 5W + 50% 10W willl not give you 7.5wt but closer to 6.6wt..
you also need to make some assumptions.

Spectro has performed best in my Lefty's and I insist on only using that.
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