We don't need no steenkin' spread sheets. Let R be the percentage of Tellus required. Then (1 - R) is the percentage of chain saw required. With ISO 68 as the desired goal, this leads to an equation that looks like this...
32 * R + 125 * (1 - R) = 68
which, when solved, leads to R = 0.61 and, of course, 1 - R = 0.39
Since I do not have a drum of Shell Tellus hydraulic oil ... Wonder what would be a good substitute for it. Would any iso 32 oil work? Have lots of Stihl bar oil in the shed.
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