Hello, the following question I had already asked in the RV & Caravan Forum, but unfortunately no answer was received. I am currently asking which coolant is suitable for which engines, or which motors containing silicate and which motors need silicate-free coolants and since when there is any distinction between silicate-free and silicate-containing and for what silicate is good and where harmful. I am aware that one should first look at the respective operating instructions, but for some vehicles this does not always lead to the desired success. For example, “nitrite-free long-term frost and corrosion protection agents” are required, but no statement about the silicate content is made. I am quite sure that one should not mix silicate-containing and silicate-free coolants, or only under certain conditions, but that is why it should be by the way. Otherwise, I have collected rather contradictory statements, which I do not want to repeat here. I look forward to expert answers. My regards Herbert PS: here there was a similar question a few years ago, which was not answered sufficiently for me.