oil change t/t

Please be careful. Most bearing sleeves are bronze and motor oil, specially hypoid differential oil contains moly disulfide to protect gear teeth during extreme loading conditions. The MoS2 is a sulphur compound and will attack brass and bronze.
If you use an engine oil, a non detergent oil is best.
I would stick with the manuf. recommendations.
my $.02 YMMV

Amen, brother Nick.

I should have been a bit more forceful in directing folks to the link to my bearing faq in the above post, where I mention to stay away from detergent additives.

While experimentation is can be both fun and productive to those so inclined, the golden rule in medicine applies here too - "first, do no harm".

Cheers,
Thom

Are there any high quality synthetic motor oils without detergent additives? Anyone know if Royal Purple or Amsoil have additives?

Did a quick search. Lots of additives in Amsoil.

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.