TLDR: temps up to 112C seems fine for N52

From http://lindvigs.com/obioban/spec.pdf :

"The coolant pump also operates differently than conventional pumps when controlling the engine
temperature. To date, only the currently applied temperature could be controlled by the thermostat.
The software in the engine control unit now features a calculation model that can take into account
the development of the cylinder head temperature based on load.
In addition to the characteristic map control of the thermostat, the heat management system makes
it possible to use various maps for the purpose of controlling the coolant pump. For instance, the
engine control unit can adapt the engine temperature to match the current driving situation.
This means that four different temperature ranges can be implemented:
• 112°C ECO mode (economy)
• 105°C Normal mode
• 95°C High mode
• 80°C High + mapped thermostat mode
The coolant control sets a higher cylinder head temperature (112°C) if the engine control unit
determines ECO mode based on the current operating conditions.
The engine is operated with relatively low fuel consumption in this temperature range as the
internal friction is reduced."