Due to politics in Cali, Valvoline VR-1 is not readily available any longer... I had always used Delo 400 in the trucks and tractors - for decades. Now I use Delo 400 15W-30 SD (severe duty) as my break-in oil for rebuilds and non-desert 4-cycle bike engines (desert bikes get 5W-40).
It's Cali so I don't much care about the cold start viscosity. More about the add pak and the base oils. Delo 400 has been in my big Bronco for well over 200,000 miles and still going strong. It's prolly the best mixed fleet oil readily available (to me).
Delvac and Rotella are fine, and I have used them in some applications. But my fall-back oil is always Delo
And yes, I own stock in XOM, still does not make me a M1 fan boy ...