I saw the oil ended to cooking more after the oil was skimmed, then i increased temperature each time the oil was skimmed until the oil got near boiling temperature before i stopped and let it cool down and added in the bottle.

My observation are also: increased boiling point. Difficult to feel and see viscosity are increased in compared with castor oil, more like as thinn motoroil. I has not equipment to measure viscosity.

Not tried to run the engine with unmodificed olive oil.