Difference in Coolant/Oil temp

[Djrystofer]

I've recently bought a bmw for a steal,
However it has a quite minor issue. It's Thermostat is stuck most of the way open, so the coolant never actually goes over the quarter way mark unless it's been sitting idle for a while, in which it does start to get a bit hot (as the thermostat is only partially stuck open)

I'm just wondering to the people who maybe have had the same issue, is this damaging the motor running cool? Does the oil get up to temperature, even though the coolant is still cool?
cheers