Nope all bmw v8 v12 engines starting from 98 are built to fail with 105C. If your car never goes to 103-105 it means its either half opened or bc DME opens it too early. I personally saw one e65 where DME kept it fully open all the time!!!
It depends on some factors like intake air temp sensor and engine temp. If DME sees that it's super hot outside it would open tstat earlier.
Anyhow I totally understand what's going on:
I bought 160k miles e66 and it worked great but radiator was leaking a little, so replaced it and it worked for a while but recently I got a leak from somewhere else bc of high pressure.
In other words this stupid super hot cooling system sucks and will keep exploding weak areas of this system!!
You fix one leak and you'll get another one over and over, until either you overhaul everything related to cooling system or you replace engine
What a great car and great ideas
Yes they want more money from us and moreover they don't want luxury vehicles to last over 60k warranty miles and 105C tstat is a brilliant solution!
Coolant pipe and rear cover profile gasket and a heater core are the worst : and all these gaskets only last 3-5 yrs max. I'm not even talking about all oil leaks related to high temp