Gaurav Posted October 20, 2019 Report Share Posted October 20, 2019 I know mixing red and green color radiator coolant is totally unacceptable, but can we mix different brands of same color - green coolant while top up? I have filled originally with Mitsubishi coolant and then used ENOC green coolant occasionally to top up since last 1 year. Recently added Prestone green coolant to top up and now I had 3 leaks in 3 weeks. So doubting if coolant mixing could be the cause or is it a pure coincidence. 2 Let's root for each other & watch each other grow. Link to comment Share on other sites More sharing options...
treks Posted October 21, 2019 Report Share Posted October 21, 2019 It can happen that the various corrosion inhibitors in different brands of coolant react with each other to form an acid that attacks seals and/or mating surfaces under gaskets and seals. Other times, and depending on the mixture, coolant additives can cancel each other out, so you may think that your engine is protected, but meanwhile, the coolant mixture is destroying it from within in various ways, and the first time you notice something is wrong is when you start getting coolant leaks. So no, mixing coolants is never a good idea. 1 1 1 Link to comment Share on other sites More sharing options...
Barry Posted October 21, 2019 Report Share Posted October 21, 2019 There’s also an issue that different coolants will gel rather than mixing which can create hotspots in the engine and cause things to warp or weaken. 1 1 2 Link to comment Share on other sites More sharing options...
desertdude Posted October 21, 2019 Report Share Posted October 21, 2019 That's a big no no in the BMW world too not to mix it's blue coolant with any other because it will turn into a gel. 1 1 1 Link to comment Share on other sites More sharing options...
shadow79 Posted October 23, 2019 Report Share Posted October 23, 2019 That's why I ask people to put ac water if in doubt or can't find the exact brand of coolant . As that will only dilute it and not make much issue... Link to comment Share on other sites More sharing options...
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