Hello, the topic has already been addressed and dealt with in various other threads, but somehow I have not yet found an answer for my problem. In my S40 some cooling liquid is missing. In other words, the stand is not in the middle between the markings “Min” and “Max”, but rather at “Min”. Can I fill this up with tap water without hesitation, since there is hardly any risk of frost at the moment? Or does the smallest deviation of the mixture, which I don’t even know, because it always makes the workshop a safe function of the cooling circuit? Thank you already for your answers! Greetings, S