Yep, I agree whole heartedly as well. It's one of those situations where BMW coolant is not available at every service station along the highway. In speaking with the SA just now, it's a no brainer to put whatever possible into the reservoir to prevent the engine from overheating first and foremost. Then next preference is obviously the BMW mix, but he said that Peak blue bottle is the next best. It's not recommended, but it's much better to use Peak than let your engine overheat.

I simply cannot believe that these radiators are plastic. When he showed me where the leak was coming from, it looked like a broken piece of tupperware.