Amen on the Mobil 1 and think twice about that other stuff
Now I don’t want start a dreaded oil thread but I’ve used it in both my 85sd’s for years. One with 370,000 and the other 171.000. Previous owner used Valvoline Advanced Synthetic so can’t complain because that engine is tight he really maintained it well. (He raced stock cars).
My Pop, when he picked an old diesel ( truck, dozer, tractor,etc,) that been sitting he would drain and fill will cheaper oil brand and mix tranny fluid, it’s a good detergent and run it drive it drain and fill repeat.
I think about him every time I open the hood and his old tool box.
greazer2b