radiator necks on cars that have green as well as blue. On my own i've used blue with no problems , no broken necks and no broken thermostat housings. I use prestone extended life on virtually all of my customers cars unless they specify something else. I usually ask them. Most of the older bmw's i see including e46 and e39's somebody at some point put green in and i've now been having good results with the Prestone long life ,all models all makes. Costco has it in a pack with 2gallon of unmixed antifreeze and 1 gallon of windshield washer bug cleaner or deicer. Its about 22.00 for the 2 pack or 11 a gallon each with a freebie on the bug cleaner. I've had good results on every car i've used that in .... in fact i'll probably change my own bmw's over when i do the next fluid change on them ...... maybe. My only rationale for not using the bmw is that its getting pretty prices these days... much more so than it used to be.