Alright guys, I opened that crank up and here is what I have. I suppose it's a regular Square Taper Bottom Bracket. But correct me if I'm wrong. So now I think I need to get a bracket opener and clean it all inside.
I'm just thinking, maybe I should get rid of biopace crank alltogether and replace it with some regular round $30 Shimano crank off Amazon. I think BB should be included in those sets. I'm just not sure if this oval shape is of any use to me as I'm not doing any trails, I'm just using my Giant as a hybrid for casual riding at the evening.