Another data point from this site:
"I wonder how many people (like me) got the call from the service department to tell them that all three needed to be done (at a cost of over $1500). Maybe because the three problems are related? Little hardened bits of rubber from the OFH gasket circulate throughout the cooling system and eventually foul the water pump and thermostat."
e90 - N54 Oil Filter Housing gasket replacement (2007 335i automatic)