Hi, unfortunately, I’m more attracted to computers than to cars, so I have very little idea about common problems. I hope therefore that you can help me. 3 years ago I had the message with my Seat Leon (Bj 2014) that I should check the coolant liquid and found that it was below the minimum value. Therefore I wanted to buy a new one and refill each with 1:1 destilated water. At the same time I am on the M13 Mofi At that time, I had been googled after the difference to the G13 which is on the coolant tank of my car. I found nothing and because the value “TL774 J” was the same I used it. After about 6 months “suddenly” my car heating did not work and I went to the workshop. There the heat exchanger was changed and criticized, that probably the cooling liquid would have glued everything. At the latest I was aware that I was afraid Now 3 years later the same message of my car comes back and the coolant is below the minimum value. Now to my question, so I hope I don’t make another mistake: – Can I buy any real G13 coolant and refill it 1:1 with destiled water? – Is it destilated water or can one also take lime-poor water? (have somehow read both) – What did I do wrong the first time? Is it simply because ss M13 is not compatible with G13? Although the color is the same? On the package also with TL774J in brackets G12++ is beside it. My knowledge would also have to be compatible with G13 with G12++? I hope you can help me, many thanks