Hi, the name like Glanz Lube is making you come forward and say that all information in this thread is wrong and false whereas I can point out many things on your knowledge. Yes, we are in this business, from manufacturing to wholesale selling(Covering Americans, European and Local) but not with this name. the only information given before your first comment was an API chart from their website and if you and to tell them that they are wrong surely they will not have time to waste on this. secondly, the DOT 3 and DOT 4 which you are mentioned especially for European cars, is not like that. I guess there is a need to know why the car needs to have higher boiling point liquid rather than giving a try to have more boiling point liquid in your car. To have coolant and not to have coolant is entirely your choice as it belongs to you. my point will remain like this that if you have to add water in the coolant then what purpose left for using coolant. -40 temperature in GCC I never experience so far may be due to my limited mobility in this region. however, you have clearly avoided the topic of required/recommended viscosity by the manufacturer. if a car manufacturer recommends to use 20 viscosity but you want to use 50 based on temperature reasoning then again it's your choice because it's your asset.