[dradernh]

Originally Posted by aerobod

I would check which generic coolant was added, as it needs to be silcate, nitrite and amine free (which something like Prestone green is not). BMW, Xerex G-05 or G48 coolants in long-life specs are compatible, but many aren't. The long term effect of using the wrong coolant will be deposits and/or corrosion in the system and certainly an effect on the factory fill coolant life. If the coolant added was unknown, it is best to have the system checked and flushed. Bear in mind that the B58 engine requires a very convoluted vacuum fill procedure, which BMW claims could lead to engine problems if not followed correctly, due to not being able to eliminate system air pockets by using conventional fill and bleed methods.

This is why one of the first things I do when I pick up a new vehicle is buy a container of the OEM coolant and find out how it's supposed to be used (e.g., mixed 50-50 with distilled water).