Air conditioner leak detection dye should be a good use here. It's made to go in lubricant oil. I am reminded of the rolling in flour and look for the wet spot ,looking for leaks. The dye is less messy.Or just an UV tracer dye in the oil. Just be aware the UV dye and light must be match up or it will not work right.
I used UV dye in both the engine and Hyrdo oils. Sure make it easier to find leaks.
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