Goran,
Quote your OP, "new oil need 10 sec to flow through an orifice, my used oil needed the same 10 sec."
In other words there was no effect. Purposely diluting the oil with ethanol (what a terrible use for snapps!) and finding that it is less viscous is what is predicted, and shows your engine oil isn't diluted.
You're worrying about something you need not worry about!
John
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