Hello dear screwdrivers and professionals I have next Thursday my final exam to the car technician in Innsbruck on WIFI and I have heard that in the professional discussion of the most accurate about the cooling frost protection is examined, which causes me very much fear because I have never heard that in school or in the training company (there it also nobody knows). Therefore I turn to you What is it about the colors? (red, pink, green, blue, yellowish) What has it with silcat halty and silvery What is it about G11 G12 G12+ G12++ G13? What is it about ethylene and propylene? Which manufacturers use which specifications or which colors? And what does cooling water consist of? (Glykolether?) I work on BMW and Fiat therefore could you please go a little closer to these 2 in comparison to VW (the question the examiners seem to like) See what comes out With friendly greetings