1149328 GM Original Equipment 10-5046 Dex-Cool Leak Detection Tracer Dye - 1 oz

Seems to be genuine Delco dye. I haven't had a leak happen yet with it in the system but I expect it'll do what it should if and when the time comes... Ran it in a couple systems for a couple months and doesn't seem to have caused any problems.

Well sealed bottle in the box. Nice and bright blue under a UV light. Will be grabbing another bottle after repairs are completed to verify we got all of the leaks. Update 3/11/25 Ordered second bottle, yep, missing it's cap and the foil was punctured like other people complained about so I guess you have a 50/50 shot of getting something that's actually usable.

très satisfait de mon achat

I poured the whole bottle in my 06 Tahoe that has Dexcool antifreeze, drove around a day to let it circulate thru the system. I waited until it was starting to get dark outside then used a blacklight that I ordered from Amazon and shined all over the cooling system. I was able to find the coolant leak easily with this dye and the blacklight. You can not see it without using a blacklight.

Just replaced the radiator on a 2015 Buick Enclave. A month later, can smell antifreeze. Could see wet all over but not where from. Added this dye, ran it for 20mins, could see the leaks immediately. Both passenger side upper rad hose, and a smaller leak from driver's side lower rad hose. Needed a UV/blacklight to see, as expected. Will buy again if needed. 5*****