One of thje things that could set a company like Kendall apart from many as to quality, was that they bought the best base oil they could get. Outfits like them, HydroTex, and no doubt Schaeffer, they would not accept medium or poor quality base oil to make their products. It had to be a naturally high viscosity index oil with certain other excellent qualities. Now days, the big boys are about all using Group II base oil, which makes for better products than were extant not so long ago. Not long ago, Cat recommended 10,000 mile oil drains in big trucks. Now they go easily 30,000 miles, better base oils and technology allow for this. I well imagine that Conoco is still building a fine product in the Kendall line.