I had/have an
oil leak and I searched around and it is very hard to identify where it was coming from. I bought some dye and a LED UV flashlight and wow what a difference.
Added dye let is idle for 5 minutes checked for leaks. Found some seepage from the left rear of the valve cover. Front (left) side
oil galley plug was leaking a good bit. Used some teflon tape and the leak stopped. There is some other
oil I am concerned about but I have to run it some to know. I also have an advantage that I have a drive on lift so I can easily get under the car. I actually ran it on the lift and could see the amount of oil coming out.
After testing some Superclean and paper towel and the surface was clean and "testable" again. Definitely worth the investment to have in the toolbox.