This morning our 2010 Prius [not in signature because I don't service it] had its 190K service. When complete the dealer made several written recommendations for the 200K service, including a tune up, engine coolant flush, inverter coolant flush, and a motor oil flush. When asked about the latter, they said they would change the oil, run a motor flush, then change the oil again. Is this a normal service for a Toyota at 200K, or is someone trying to pull a fast one?