I had a small oil leak a month or 2 ago. Traced it to the crank shaft and installed a new seal.
A couple days later, it was still leaking, I installed another (new) seal and thought I was done for sure.
Surprise, surprise... It's leaking again, badly. I can actually watch it drip off the balancer.
I know it wasn't a bad seal because this is the third one, wtf?!