75W or 85W is the Cold (W)inter Oil Rating. 140 is the Hot Oil Rating. (212°F, 100°C)
The Winter rating specifies the Viscosity of the Oil at 0°F (-18°C)
I am guessing that it never Snows or even come close to Freezing (0°C) in Saudi Arabia so the difference between 75 and 85 will not be an issue.
Even so, 75W would generally be considered "Better" than 85W.
Bill Hertzel Rotax 912is North Ridgeville, OH, USA Clicking the "Thank You" is Always Appreciated by Everyone.
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