I think that *a lot* of us appreciate the time you spent in figuring it out. It's been stomping me for some time!
Can you confirm that the dye has an oily feel to it? I think you've already confirmed that, somewhat.
When picking up UV dye from an automotive shop, there are a few options. The dyes are available specifically for: refrigerants (A/C), Diesel fuel, radiator coolant, and engine oil.
I would suspect that all of them use different grades of oil, but I would think that the engine coolant dye would blend in fairly well.:shrug:
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