Lisle 75630 Test Fluid

Works as intended.

Glad I found this on Amazon. I haven't opened the bottle yet, but if it works as good as the stuff that came with my combustion leak kit (which I expect it will, since the bottles are identical), it will work like a charm and at half the price of ordering a replacement from the catalog. Make sure to test your results. That is, if a combustion leak ISN'T present judging by the lack of color change, exhale into the tube and see if the CO2 in your breath is enough to cause the blue to turn greenish-yellow. If not, then the chemical itself is faulty. The process I use is to let the car idle for about 5-10 minutes with the hood open, then get in and raise the RPMs to about 1200-1500 while in Park or in Neutral with the parking brake engaged. Then, I get out, open up the expansion tank cap, and a vacuum line to the engine, and use the vacuum to draw whatever gas is present in the expansion tank into my testing kit tube. I let it do that for about 2 minutes - if the color doesn't change, you're good to go.

Delivery time okay. Did it's job. I was looking at the Block Tester BT-500 which provided the tester and fluid. But for the same price, I bought this fluid and the OEMTOOLS 27145 Combustion Leak Detector, which comes with a case for the tester for the same price. I confirmed I had a head gasket leak (light green rather than color changing all the way to yellow). After research on Youtube, I went with K-Seal Pour and Go. Took about 3x cycles of running the car with radiator at operating temperature, and then poof, my Check Engine light went out. From reviews, it seems you will get at least 10k-20k miles out of it, some claim never a problem again. If the problem does reappear, I will probably then try the K-Seal Ultimate gasket seal.

This is about the same price as other "OEM" brands, but you get twice as much. Use with OEM # 27145

Excellent product at a low price. You can really fashion your own tester as long as you can find some materials that provide a vacuum, and it doesn't need to be a perfect vacuum either.... a rubber washer, some tubing from the hardware store, a plastic fast food cup, and something for suction. Just keep the test fluid reservoir away from the coolant tank. This simple test fluid helped me decide if I wanted to scrap the car or keep and repair it- and the car was a keeper! Of course, i unintentionally left the tester with exposed fluid in the garage for a couple of weeks, and could really see the color change from the ambient fumes.

Works great!

The package arrived wet and the outside of the bottle was wet. The seal under the cap wasn't sealed. Regardless, there was enough product left to do a test. It's hard to tell if it's working unless it turns color, and mine didn't. So, I assume I'm all set.

Over the years of using a block tester, I never thought there could be a difference in quality of the fluid being used. Make no mistake this fluid is the fast responding to combusting gasses. When compared to the competition out there this fluid out performs in every aspect. Good quality, easy to use, easy to store and it doesn’t leak.

Pues ni modo, me salió cambio de color de azul a verde, quizá la fuga no es grande y por eso no lo cambió a amarillo. Anteriormente, por falla de la bomba de agua hubo sobrecalentamiento, todo el anticongelante se fue al aceite y produjo fuga de aceite en las juntas de las tapas del motor por sobrepresión del vapor de agua en el aceite caliente. Hice cambio de bomba de agua y juntas de tapas (no de la cabeza). Para rellenar anticongelante hice vacío pero no lo sostuvo, pero aun asi lo rellene. Pocos meses despues tuve fuga de anticongelante en el radiador. Lo cambié y aplique vacío para rellenar antocongelante, el vacío se sostuvo pero en un nivel inferior porque cuando lo habia hecho antes del sobrecalentamiento si hacía un buen vacío, pensé que la bomba de vacío ya no tenia fuerza o que alguna junta tenia una fuga no visible. Ahora con esta prueba de cambio de color veo que si tengo una pequeña fuga quizá debida por el sobrecalentamiento y que no me deja hacer un vacío superior, aunque tampoco pierdo mucho refrigerante porque llevo meses con un nivel de refrigerante que casi no baja y tampoco tengo humo blanco en el escape. Ahora a buscar un sellador de junta de cabeza para que aguante hasta el próximo cambio de bomba de agua, porque la bomba esta dentro de mi motor y así aprovecho dos pájaros de un tiro. Actualizacion enero 2026 Volví a hacer la prueba antes de ponerle un sellado de juntas y me burbujeo todo el refrigerante caliente hacia afuera, lo que hice mal fue no tapar con el dedo la salida de la.bombilla negra, eso hace que se mantenga presurizado y no expulse refrigerante caliente. Agrego la foto de como lo tape y fue suficiente para tener otra prueba correcta.

Good refill for Lisle tester

received the item on time...

quand le produit es arriver la bouteille etais vide et le livreur es repartie avec donc je nais pas recu le colis merci

If u read description u will know it's too small amount but what I didn't like in pictures they make u feel it's a big bottle and big amount