No oil pressure message and rpm drops.
 

I've read some of the posts and they sound like my problem, but there's a couple of other things happening. The oil pressure message comes on when I turn the wheel and I'm not accelerating, also when I'm at a stop with my foot on the brake or in park. I notice that the rpm drops down and the message comes on. I also feel the engine trembles a little when this happens. All this happens when I am not accelerating, the car feels great when it drives. I've read about the O rings but I'm wondering if that would make the engine tremble, also if it's just that, what kind of exspenses should I expect.

Thanks