I have a 2000 Honda Civic EX and the car has a small oil leak. This morning when I cranked it up I could hear the valves ticking pretty good. Well on lunch I added about 2 quarts and it seemed better. Well going down the road I hear it valves ticking real bad and then just grey smoke pouring out of the back of the car. I had power until around 2500 rpms and it wants to die. Able to limp it back home. I just need to know how to fix this or get it fixed just need some help with this major issue. Would like to replace the whole engine with the same motor or a Dohc version.