I recently talked the head engineer at BOS and that's the info he gave me regarding oil in Idylle forks :
==> Choose some good oil (he advises Kayaba K01) between 5 and 10wt.
==> If you use an oil that's more liquid than the original BOS one (it's the case with the Kayaba), he suggests closing all adjustments a bit to compensate (one or two clicks).
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