Spectronics Corp / Tracer TP39000601 Engine Coolant Dye 1oz.- Set of 6

I poured only ONE bottle in my 1993 Ford F-150 w/ 351ci engine. When the truck leaks a tiny spot of coolant, it is obviously bright and easy to see. It helps me see that I am leaking and helps pin-point the leak!I will be adding one bottle in each of my vehicles now.

This stuff works great in the cooling system and mixes well with antifreeze.

Easy to see w UV light. I used only 1/2 a bottle rather than the recommended full bottle and the leak still lit up like a Christmas tree.

couldn't find the leak in my dodge ram coolant system. Took preventative maintenance and replaced water pump, thermostat, and all hoses. Still a slight drip. Pressure tested and found nothing. Put one bottle tracer in, drove ten miles, used ultraviolet light and found leak at timing cover.

I had a mystery coolant leak on my car, that used a quart of antifreeze per week. I could smell the antifreeze, but could not see the leak. I added one bottle of this dye, and used one of the UV flashlights I bought on Amazon as well. I found the leak in a matter of seconds (Intake manifold to block leak - the antifreeze would evaporate before reaching the bottom of the engine). This definitely works. I recommend to do this at night, or in a very dark place, since the leak will show up as a bright green/yellow light.

One bottle will suffice for most car engines. The engine coolant glows bright yellow (opaque)when illuminated using a ultra-violet flash light. Mine is a 365nm led i got for about $33. The best time to find the leak is when it is pitch black outside.My problem was that the coolant would leak out very slowly over a period of 2 weeks and only when the engine coolant was operating temperature or higher (probably when the thermostat opened).I was able to find the leak very precisely and quickly. I also have 5 bottles left.

i drive a ford crown victoria and the car had a minor coolant leak that i was having trouble locating. I added this to the reservoir and drove it for a day and the follow night i went out with the ultra violet light to locate the now obvious leak. the intake manifold had a hairline crack that when hot expands enough to allow coolant to escape. This dye is bright. You can see the dye even in daylight without the use of the ultra violet lamp. Great stuff will continue to use in future

This stuff really hangs around! Used an entire bottle to confirm Subaru Forester radiator was leaking at top tank crimp, and it worked perfectly. Also used to verify headgasket issue on Infinity G35 - over pressurizing entire cooling system (misting from EVERY hose joint).I changed the radiator and thermostat on the Subaru, and there was enough die left in the system even after refilling with a gallon or two. Great stuff!BTW, I wouldn't recommend NOT just dumping this into the overflow... it took FOREVER to circulate! :)