ROTELLA OIL
Jim; Got mine at Sam's club in a 55 Gallon drum size. Much cheaper that way. Sam's also sells it by the 6 - 1 gal case size.
If there is not a Sam's or Wal-Mart in your area, you might check for a Shell bulk oil distributor. Most of them sell the 55 gallon drum size.
I get my oil this way, buy my fuel and oil filters by the case from distributors so I don't have to make a trip every time It's time to change. Also much cheaper in the long run.
Sold my 95 2500 SLT 4X4 Club Cab 3. 54, Pacbrake, Putco SS running boards & fender trim, Chrome Grill & brush guard, Pyro - Boost & trans. temp gauges, vent visors, hood sheild, Alcoa alum wheels, bedliner, tow pkg, etc,etc. My son-in-law and daughter have it in Arizona, looks & runs like new. Wish my 03 would get here. I miss my Cummins Turbo Diesel. :{