Although I am not personally familiar with the BMW 8 cylinder engine, my understanding is that coolant temperatures are now deliberately set much higher than in the past , in order to minimise emissions.
The early injection +8s were optimised at 85 Deg C, but later versions used 95 , and many modern tin top engines operate in the 110 to 120 range. This has entailed going to higher pressure systems of course.
As a general rule , if the water is not boiling and is not being pumped out , it is probably OK.
Andy
