Water thermostat temperature

Hi all

We finally installed a water thermostat in a plane with 912 iS. According to the operating manual the operating interval is 90-110 degrees Celsius. (194-230F)

The thermostat we got (from the airplane manufacture) is opening at 85C (185F). That means it will keeps the temperature around 82-83C (180-181F).
I would really like it to be > 90C but according to the manufacture, this is the only thermostat available.
The oil temperature is around the same, perhaps a little lower. My guess is, that it will be higher if the water temperature is higher.

My question is. Is it okay to run with 82-83C or should I try to look for a thermostat opening at >90C ?

Kind regards, Claus