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Old 03-30-2023, 09:30 AM   #4
JFP in PA
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Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 6,458
We use the UV dyes (oil, coolant, hydraulic fluid, etc.) from Uview, the guys that make the vacuum cooling system tools. All the various dyes are harmless to the fluid being checked, and can remain in the system without any problems, which is what makes them so useful.
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