After looking at the MSDS sheet for BMW OEM Coolant, I was surprised to see it contained 8 percent Sodium Hydroxide AKA Drano! Yes, that is correct. Not good for Nitrile rubber, Viton rubber, or heat cycled polyacryilate (plastic) over the long term. Sodium Hydroxide is used as a coolant on the track where Ethylene Glycol is not allowed. I'm suspicious. Planned obsolescence with an alabi ...? How many times have you seen a broken Beemer on the side of the road with steam coming out of the grills? Do your research...