I tried starting it tonight but I found a huge oil leak. It's just one of the oil cooler lines so it isn't super major but still annoying to fix.

I had my garage warm, the oil pan was hot, and the rest of the engine was warm when I tried starting it but it didn't make a peep. I had the glow plugs on for 30 seconds before I tried. Cranked it for 15 seconds, waited 15, and cranked for another 30 without any sound of it starting. Now that I have the down pipe on it I can't see if any smoke is coming out the exhaust. The engine was really easy to start back when it was in the car so I'm not sure what to do. Do I risk spraying in some ether?