I've witnessed an oil change on a PT6 where the apprentice wasn't briefed in time about shaking the tins before pouring the oil in... result was when you looked through the contents sight glass after engine shutdown it was
extremely frothy (resembling a milk shake).
I learned about shaking oil tins 25 years ago from an old air-force sumpy with lots of years of experience and like blackhand said, it takes less than a second to invert a can and shake it.
Oh, unlike Tricesyl Phosphate this Oil Additive is not very very toxic... I'm quite lovable really
