Tracer Products TP34000601 UV Fluorescent Leak Detection Dye - Set of 6

Open, place entire contents of 1 bottle in oil, run vehicle for 10-15 minutes to check for leaks. Works like a snap to quickly check those hard to find on your own traces of oil leakage. A little spent on leak dye can save you hundreds spent for a professional technician to find the hard-to-deduce leakage by themselves.

This stuff glows great with a good UV light, king of a bright orange. It's made in the USA! Dosage is on the box, I've added less and still got a good glow where the leak was. Pays for itself in efficiency in a shop when being payed by your billable hours. I will purchase again when needed, price is great compared to a single bottle at parts stores.

This stuff works great! I had a differential leak but I could not pinpoint where the leak was coming from. I thought it was probably the pinion seal but I didn't want to take the rear end apart before I knew for sure that was the problem. I added the Tracer Products leak detection fluid to the differential, topped off the differential fluid, then thoroughly cleaned the differential housing and drove the vehicle around for about a week. Then I just got under the truck with a UV flashlight in a dark garage and the Tracer Products leak detection fluid made the leak glow like crazy! It showed me EXACTLY where the leak was coming from! The pinion seal was fine - it was leaking past the third-member gasket - a much easier and less-expensive repair than the pinion seal. So this product saved me time and money - good stuff!

This and the black light that you’ll need made finding the source of a hydraulic leak very easy!

I used this to find an oil leak on my diesel truck - this product is twice as concentrated and half the price of what is sold in auto-stores, so it's a quarter of the price; I did have to use more than I expected to see the dye under a UV light but I think that's in part due to the weak UV light I have. Great product to find automotive leaks and a great value.

Purchased this product (along with Uview 413010 Battery Powered, 6 LED Leak Detection Light) to diagnose a persistent oil leak on my wife's 2006 Kia Sedona. While the oil leak wasn't tremendous in volume, it had gotten everywhere and was making the job of determining the exact source of the leak quite difficult indeed.After placing a 1 ounce bottle of the tracer dye in the oil and driving around the neighborhood for a bit, I took a look with the detection light while wearing the yellow-colored glasses. Initially, the areas fluorescing were difficult to see. After turning out the lights in my shop, however, it was much easier to see and I was able to pinpoint the source of the leak.Since its initial purchase, I've been able to use this product often to help diagnose oil leaks for a number of other vehicles belonging to friends and family. For better or worse, my home shop has become the go-to place for friends and family looking to diagnose an oil leak before taking it to the shop for this purpose. Of course, the real money-saver for the DIYer is if you're willing to make the repair as well as part of the process.My only complaint (not related to the product) is the need to have the vehicle in the dark in order to adequately see there areas where the tracer fluid is fluorescing. There are probably stronger lights out there that would preclude this need, but for the price of the tracer fluid and the UV light, it's a small thing to have to turn off the shop lights for a bit in order to see the leak clearly.

Hard to find this stuff but by far the best on the market... very bright when using the correct uv light

I used this product on a 2004 BMW 330i to help detect an oil leak I had. I used a weak LED UV light (with yellow glasses) and the product still was easy to see. I think if I had a more powerful light the results would be even more impressive.Some suggestions of using the product:1. Clean the area you want to inspect first.2. Do a benchmark or baseline visual of what the area looks like with UV light BEFORE putting the dye into the system. You never know what will glow.3. Follow the instructions of running engine for 10 minutes but not much more. If you run it too long and have a big leak, it will just be dyed oil everywhere and the leak source will be hard to detect.In the end it did help me detect my leak. This is a 6 pack and I only needed half a bottle, so this will last a long time.