I have just changed the oil in my TT platter bearing. I had put some super slippy Audio Origami in about 4 years ago but on having a look tonight it wasnt green any more so I replaced it with a nice new drop of the same stuff and also cleaned my drive belt pulley and edge of the platter with a bit of IPA (quite a lot of black came off onto the cloth.
Sitting here listening to a few LP's and I am convinced there is a marked improvement. Well worth the time invested.
If you haven't done yours for a while it is almost a free upgrade, give it a go and post the result here.