I installed my new LFP heat exchanger last night and while I was at it, I changed my engine coolent. I added a bottle of water wetter and 20/80 anti freeze and water to both the HE and the engine. The temp. gauge would always got to a little less then half way during normal driving. Now with the water wetter it stays at about a quarter of the way up. I know that the stock gauge is not very accurate but I would say that this stuff lowered the coolent temp. by at least 15 degrees. I will use my temp. meter and check it for sure in a few days. Get some and try it for yourself.