A/C Pro Certified Auto Pro Oil and Fuel System UV Dye Leak Detection for Cars & Trucks & More, 1 Oz, 374CS, Universal

Worked perfectly. Using UV flashlight saw my leak after running engine for less than 5 minutes. Highly recommend.

With this oil I was able to trace the mystery leak in my transmission. Worked as advertised. Worth the money. I used an UV flashlight I purchased separately.

I used this dye to help diagnose a fuel leak in a carburetor. It worked outstandingly well. With just a drop of it in a few ounces of fuel, it lit up bright when exposed to a little UV light. I would not have otherwise been able to find the leak since it was a small weeping leak that did not appear “wet” but the dye showed exactly where it was.

Looks more orange than yellow in engine oil under a black light with yellow glasses on. Ends up almost the same color as Dexcool coolant. Would be more helpful if it was actually yellow looking. Otherwise works like dye should.

Worked great!

I finally found my oil leak using this product. The only downside is you need a special UV light to even see it. Very cheap too! But other than that 100% would recommend for oil leaks.

Worked as it should. Great help for locating the leaky spot.

It's ok. It does work, but I wish it was brighter, kind of hard to see.

Works great pinpointed oil leak! Have had a slow oil leak on our 2002 Grand Am for the past 4 years. Nothing serious just an annoying constant oil leak In our driveway. Was leaking about 1 quart between each oil change. At first was convinced it was the pan so changed the oil pan gasket. This did not solve the leak nor did a stop leak product. So purchased this DYE put it in and went for about a 50KM drive. Brought it home, jacked it up and had a look in the dark using a black-light flashlight. Lots of oil around the pan is why I originally thought that was the leak source. Using the black light, the DYE outlined that the leak was coming from a much higher spot and flowng down on to the pan giving the illusion that the oil pan was at fault when in fact it was not. Got my answer and found the leak source

Used it for thr first time yesterday and discovered the source of my oil leak quickly . You will need a black light but they are cheap. Recommended .

Does not identify leak

It really helped to detect the engine leak

Used this to track down an annoying oil leak. Worked almost instantly. Very impressed. Wish it was available locally in a larger size.