Review on ACDelco GM Original Equipment 10-108 Cooling System Sealing 🔧 Tabs - 4g (Pack of 5): Optimal Cooling System Maintenance Solution by Brian Shakey

This is what GM uses in new cars. They do an excellent job on hard-to-find leaks. They obviously won't fix a water pump or head gasket problem, but as intended, they will fix small leaks and won't destroy or clog the cooling system like most parts store crap. If you ever want to use a stopper, this is the only one worth using. It also leaves no trace of ever having been installed. It works on anything with a cooling system, from ATVs to semi-trailers and everything in between. This is the only stop leak I have ever installed on a vehicle that I wanted to keep.