Nick,Glysantin for the bmw is G48 not G05, Its produced
by Zerex here in the US for distribution in the US. The GO5 is a very light yellow almost clear also produced by zerex , used in Mercedes, Ford and Dodge/chrysler
Originally Posted by genphreak
This is not as simple as colour.
Some Greens (there are many) are downright dangerous in our engines as they are high in phosphates. BMW are not the only people that make aluminium engines/components and mix them with other stuff. A lot of manufacturers spec/make blocks and castings themselves so the variance is really the composition of the castings and how the corrosive and cooling properties of the coolant are balanced to suit. This is why a coolant that is 'OK' to use in one alloy engine is not OK in another. And the definition of OK varies I suspect also. The Germans have obviously gone to a lot of trouble testing theirs, let alone developing their own standard product, so why anyone would want to use something else (apart from availability) in a car designed for that I can't imagine.
The question really is who is using a friendly coolant and who is using the factory Glysantin (G05, blue), as opposed to who is using some drop-in and don't know whether is harmful or not. Either way, there are no studies done on other coolants that will tell you (in all conditions) that they are not harmful or even suitable to your model so the issue is surely moot- saving $10 but risking corrosion/cludging (esp. without the engineering tests to know what's what) seems somewhat foolish.
I'd hate to try and explain why its green, purple or whatever in there instead of a nice shade of cool blue... I wonder if the BMW car club judges frown on people that have different coloured expansion tanks when they are showing their cars?Does anyone even have tanks that aren't blue at a BMW CCA show and shine??
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sorta like evans 