Ok, i have a 400 chevy and when i start it up it's hard to start at first, usually starts right up. Also when i start it up now it's leaking oil down the oil filter, lots of it too. But after it starts the leaking stops and it drives and runs fine. Also on the start up there seems to be grinding coming from the starter area. I changed the starter thinking it was the problem on the grinding, but still does it. Put shims on it too so i'm pretty sure it's not contacting the flywheel. No idea on why the oil lose now, it happened all of sudden. Drove it to my friends, and it didn't do it drove it home and went out an hour later to move the jeep and i heard the grinding but no leaking....after a few more starts the oil started leaking. Any ideas or suggestion?