Alrighty, goofing off in the shop with a milk frother and some lab beakers.
Left to right, Mobil 5w30 full synthetic, Mobil 0w40 Euro, Supertech 15w40 conventional, Delo 5w40 XSP, and everyone's favorite foam monster............Rotella 5w40.
Added 200ml per beaker and let the foaming begin...