Of my friends who work in a transit bus garage. One is a passionate Valvoline guy but will run Mobil 1 synthetic, never conventional. Occasionally his vehicles get the Lubrication Engineered oil that the pump won't pick up from the bottom of the 275 gallon tote from work. Another mechanic there is a die hard Kendall guy, the other two mechanics would likely get into a fist fight arguing over Delo and Delvac, the last mechanic runs Rotella in everything.
My really good friends at my old machine shop aren't oil picky at all, heck the lead machinist there will run clean looking oil in his truck that has been drained from a warranty engine or from an engine that has come in to be rebuilt, he's a whatever is free or closest to free kinda guy. Funny enough he only changes the oil in his 350 powered truck once per year, at deer season, and somethimes he misses a year. Still going despite the abuse, his argument is that he can rebuild a 350 in a weekend for $175 so why waste money on oil changes. Funny thing is his 350 has almost 200,000 miles on this rebuild with yearly or ever other year oil changes with whatever is free or cheap...