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Message: <blockquote data-quote="Alvin" data-source="post: 42810">2centsYou definately need water as the main with a mixture of water wetter. There is a guideline on the box if you buy the redline one for the ratio. You should never use coolant 100% as it will harm your radiator & parts of the cooling system. As for whether 100% water or 50/50 water/coolant its stated in the article below that its not to reduce the temp gauge but for efficiency of dissipating heat. How? does it works? Like below to prevent vapour build up at hot spots. This is mainly for those who are performance oriented & pushes their cars or races. For example, in the kart championship the radiator of the rotax 125cc engine is sealed to prevent usage of water wetter. Officials will actually test the water in the radiator. Especially for racing it does help. Cost is not high so i think its worth a try. Then you can judge the effectiveness of it. If for daily normal driving then i think the stock BMW coolant should be sufficient. But then again it cost almost the same. Not sure about the ratio for Albundy's in-body herbal tea water wetter though.  <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite7" alt=":p" title="Stick Out Tongue    :p" loading="lazy" data-shortname=":p" /></blockquote>