ACDelco GM Original Equipment 10-5057 (12378563) Engine Cooling System Tracer Dye - 1 oz

This stuff is strong! Had a very slow leak for years, mounted to basically vapor, never leaked enough to get on the floor, but the smell was annoying, and I did have to top off the coolant every few months. This Audi has a very complicated cooling system, it even splits into two parts to send coolant separately to the supercharger. After putting the bottle in and running the car, I was able to find the leak in seconds. That said, this stuff does not flush out of the system. You’re going to have die in your coolant pretty much forever unless you completely vacuum flushed the entire system. In my case, I drained out What I could from the radiator and the hoses while I was doing the repair and although my OEM fluid is pink, everything was bright fluorescent, yellow green from the dye, as it should be. But even after flushing as much as I could, it still was fluorescent green, with about 80% new purple OEM fluid it’s still pretty much green, lol not a big deal. And by the way, I dropped about a gallon of coolant with the dye in it on my concrete driveway and it rinsed right off no problem.

Shows leaks perfectly. Shows bright green with UV light. I suggest using half of what's recommend.

I've had a coolant smell coming from the front of my Jeep since I bought it 3 years ago and I couldn't find the leak to save my life. I've only added a quart of coolant the entire time, so I knew it wasn't that bad and I watch the level like a hawk. I decided to try this stuff just for fun and wow! I found it in daylight as soon as the engine warmed up without a uv light! It was the last place I would have guessed because the seal on the radiator cap looked fine. Once the system pressurized, it pushed past the seal and turned into steam. So THAT'S why I never saw any leaks! I was ready to replace the radiator, but all it needed was a $10 radiator cap! BUT WHATEVER YOU DO, DON'T SPILL IT! This stuff is SUPER concentrated! I spilled the smallest amount while pouring it in and tried to wash it off with the hose. Now my driveway looks like a nuclear waste spill. This is all from spilling about 1/4 ounce. And no, it's not coolant on the ground. Highly recommended!

Works extremely well and easy to detect with light.

34yrs of turning wrenches and this stuff here is what you’re looking for to find those pesky leaks in any coolant. Super green glo ( find even the tiniest of leaks) NOTE: you need a GOOD black light. Cheap on here

It works, I put it in the system after replacing my thermostat housing, numerous hoses and lines, and radiator. I didn’t have any coolant leaks, I found that a trans line wasn’t fully seated so I had a very small trans fluid leak. The dye residue on reservoir cap was very bright under light. *this will change your coolant from orange to a bright yellowish color*. I haven’t seen any negative affects from adding it to my coolant, but do wonder if it is also compatible with trans fluid as I would like to put it in there as well.

Worked like a dream. Very easy to use. Just dump it in the coolant overlflow reservoir and let your vehicle run. I used this to spot a leak and make it easier to find. Ended up being water pump gasket. You don’t really need a uh light to use this stuff it’s very noticeable it’ll turn your coolant a bright yellow.

Decent price works as it should

Es un tinte muy práctico

Do as advertised