Have found that G05 concentrate & premix is generally reasonably accessible in consumer-grade packaging through heavy vehicle outlets (truck stops, truck/heavy vehicle parts dealers) and some select automotive shops. Would personally like to use G48 for added peace of mind; but have had a lot of difficultly locating anyone who stocks this stuff through Google searches. The best I've come up with are things like 20L drums of concentrate for anywhere north of AU$150. That's great and all - but I don't need that much coolant! I had previously thought Pentosin had me covered, but it turns out the product I used was G12 coolant... Not sure if this is a European dex-cool equivalent, or what. In any case, its time to change it, and I would like to be using something resembling factory specs. Obviously, if G05 & G48 are more or less the same, and interchangeable, I am happy to just use G05. I also know that Penrite produce a "G48 approved" coolant, which is green... This is a H/OAT coolant that is supposedly guaranteed for much longer than the bi-annual change interval recommended by BMW, and there is no mention of the silicate content - both of which make me a bit wary of the product. Motul is another "blue coolant," but unfortunately this is G11 Rated. So that's the predicament... Any suggestions? Would like to be using the factory-recommended product, there's a reason a specific formulation is recommended over some generic green coolant.