The labelled weights don't mean much. The viscosity is what matters.
I believe the Marzocchi 7.5wt is around 26.40@40cSt and 9.90@100cSt
In comparison Silkolene RSF 5wt is 26.70@40cSt and 9.46@100cSt
Thats just one comparison. Also, regardless of what the manufacturer recommends, its also just another tuning variable and more importantly is selecting a particular oil and working with it to achieve the desired goals. A lighter oil will pass through the valves quicker. Lighter compression damping, and a faster rebound.
In my closed chamber I've been using Amsoil 5wt hich is only 15.9@40cSt and 4.4@100cSt.
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