I'm unconvinced by their blurb.
There is a whiff of snake oil sales techniques....
The BMW cooling system is well designed and complex: on Tarka the temperature gauge never goes over 100C, even when on a circuit and being thrashed. The radiator is large and efficient.
The one weakness is a pipe that runs along the V, under the inlet manifolds. It has O rings at each end. If the O rings fail it is a painful and expensive repair.
My tame BMW mechanic, formerly a lead tech at the local BMW Dealership, said that BMW advise using any other coolant than the BMW pre-mix voids all guarantees and BMW Franchise workshops will not work on cars filled with any non glycol based antifreeze/coolant. I suspect there is good reason for this.
Just my two pennyworth, I will stick with the relatively cheap and well understood BMW Antifreeze Mix.....
