I understand your very knowledgeable from reading your post in tech... but your wrong.
First, search "Lucas oil foam" on google and you will see countless articles on it happening, including the truckers your referring to.

Your first claim on oil grades....Mineral based and synthetic oils are the same viscosity at operating temperature, but before reaching that point they vary alot. So much that at a low enough temp, your car wont start with a mineral, while the synthetic will perform fine.

And your idea about synthetic break down is way off too.... mineral oils have improver in them to keep them thicker, they wear and the oil thins.There is no improver in synthetic...there is nothing to break except additive. The synthetic molecules never break down.

And then the about you looking into foam in turbo cars and not the truckers that use it the most..... Almost all of us play with boost, almost none of us drive semi's, so why does this matter?

Thank you for the info on the "mechanic in an engine" though.