Hi guys I have an 87 gxl, and a wierd oil problem. When I first start the car it smokes a bit when I step on the accelerator then after a few minutes it goes away. I'm pretty sure this is normal though. During the time that I drive the car while the engine is not fully warm the oil pressure is normal, 30 at idle and 60 at 3k rpm. After the engine warms up completely though my oil pressure drops to almost nothing at idle and 30 at the most at 4k and higher. I think I have a small oil leak but I'm not sure. Some one said it could a an o-ring seal or something.
Any advice would be great!

Thanks

Jon