Rotella is great- - - -I used it for many years on a fleet of over the road diesel trucks, and backhoes, dump trucks, etc. Now I use "Traveler" brand oil sold by Tractor Supply Co. or whatever generic 15W 40 Walmart sells in their store brand containers. I strongly suspect that's whatever major brand gets the low bid contract for a particular batch.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!