As some have said, the additives used in motor oil are really not conducive to use in bearings especially copper based. If you must use an automotive oil, then use gear or transmission oils. ATF should be fine, but truelly, for the duty of the bearing in a turntable even olive oil would do. I use simple 3 in 1 sewing machine oil in my Alex III and it sounds fine after nearly 15 yrs of moderate use.
Bob P.
Bob P.