Make mine synthetic- Mobil1 15W50.  Last time I found some at Wally
World, I made off with a 4 jug stash, which should hold me for a
while.  The stuff seems to be getting scarce.

  Nothing wrong with non synth, but I want/need extended drain
intervals because my bus is used mostly for extended trips.  This way,
I'm never needing an oil change- or two- in the middle of a trip.

  I also discovered an added bennie after switching oils- my old WBX's
occasional lifter noise went away for good.

George/ATL