Stihl Canada and Stihl USA have 2 different suppliers for the premium if you look close the Canadian Premium should have a Castrol logo on it, as far as I know the full synthetic Ultra is the same batch in both countries.
If I remember correctly back in the early '90s I would burn 4 liters [1 US gal] in a 7-8 hr day while logging with my Stihl 064-18".
No heavy bucking, just falling, limbing and topping small-medium timber.
I asked a Stihl engineer from Germany back in 1986 face to face what is the best mix oil to perform in their saws for work applications and he said Shell series 3 diesel engine oil.
This guy was one of the head designers of the 028 038 048 series
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