TSI SupercoolSynthetic U/V Leak Detection Dye, 1 oz, 1 Application

Worked perfectly! I was having a slow coolant leak on my 2010 tahoe that i couldn't see where it was coming from. Put this in but i did what others here recommended, i only used like 1/4 of the small bottle and drove to work, and when i drove back home i popped the hood and with just the light on my phone i could see the leak with the bright green color by the thermostat inlet and when i got under the car i also found a leak by the water pump seals!

I'm getting old, don't wanna waste more time then needed looking for leaks. This dye works awesome, although 1oz per system seems to be abit much imo. Think you can get away with .5oz no problem. Good and bright under the uv, pin pointed my leak easily.

Very concentrated as others have said. Don't use more than half to start with! Super great dye!!! I highly recommend!! It makes it easy to find the leaks!!!

Works well and easy to see with a black light.

Nice and bright fluid really helped me find my leaks. It really helped me pinpoint my coolant leak, sadly that leak was from the intake manifold instead of something easy.

Everything arrived as advertised. I haven't used it yet but looks to be perfect! I will post pictures after I use it.

Works wonder for any automotive fluid leak, Cheaper than NAPA. Glows like its radioactive :)

I put it in my coolant reservoir and radiator was leaking but the dye could not be seen. Not sure that the fact my coolant was green prevented the dye for being visible.