DSB4193

Ive searched through tons of threads about squeals on here but none of them have the specific symptom mine does. My car recently developed a squeal and seeing as how its sittin at just over 180k I didnt think anything of it. I figured the pulleys had never been changed so I replaced them all for good measure. Unfortunately the squeal didnt go away and has within the past week gotten unbearably loud so I busted out the WD-40 to try and find out where it was coming from. In the end the only thing that will stop the squeal is a fair amount of 40 sprayed directly behind the crank pulley. I have a slight leak from the front main so im going to tear it down this weekend but I have no way of getting to the parts store once I do, so I wanted some opinions on what the squeal could be coming from. Thanks in advance.