So I seem to over tightened my sensor for the oil pressure sending unit. Noticed it when I started my car and it streamed out oil from the bottom. Came across this crack. Would jb cold weld be able to fill this in for a temporary fix for a couple months? Or to seal the leak until I fix my lower and upper oil pan leak? Or any type of adhesive?? Any help would be much appreciated. The crack is shown in the photo. It's a small hairline crack

 

The obvious issue is that the crack is subjected to oil pressure, so sealing it is going to be a real uphill battle. If you could get some JB Weld behind it, and fully into the crack, it might work for a while. But, applying the sealer from the outside, and to a crack full of oil, you're just not going to get a good bond, and the oil pressure will push it off quickly.

 

JB Weld is useless junk for issues like this one. Someone who is decent at TIG welding might be able to fix that crack by enlarging it, filling it and grinding it down flat. Otherwise, start looking for a replacement upper oil pan at salvage yards.