Has anyone else been ripped off regarding a leaking thermostat housing gasket? I own a 2018 Q5 Prestige. Last week, during my 60,000 mile service, my Audi dealership told me my thermostat housing gasket was leaking and it would cost $1,375 + tax to replace! When I asked why it cost so much for a simple gasket, they said they have to replace the complete water pump/thermostat housing unit to replace a new gasket! Really?