Oil Pressure Too High

I had a physics teacher and gear head in college.
The walls of his office was covered in photos of him road racing AC Cobra's when they were new.
He told me one thing and it has stuck with me.

He said and I quote "Always use the thinnest oil that you can get by with" he went on to state thicker oils may not allow quick enough drain back to the oil pan, creating oil starvation problems.