I know some of U remember this stuff from the 1980’s. I worked at my uncle’s Arco/Sunoco station back then and we did a lot of oil changes with this nasty stuff. Oil color didn’t mean jack since It was black as coal when it was brand new! I ran the 20w-50 in my 2.8 v6 Chevy Citation POS all yr long. No idea how it survived past 140k when I sold it. Ah the good old days...