John Belushi's character to Dan Ackroyd's character in the movie "Neighbors," as Belushi is giving Ackroyd his car (an AMC!) in an extremely generous gesture: "Use Wolf's Head 30 weight. It'll never let you down." I thought that was a Hollywood fabrication until I saw a porcelain Wolf's Head sign at a bar years later. One of those old-school brands without much purpose, and refuses to die. Otherwise, probably a perfectly acceptable "SL" oil.