Mobil 1 5w30 Synthetic every 5k regardless of driving conditions, I always used to drop the couple quarts of tranny fluid at the same time I do oil, Keeps the tranny fresh and reliable and very cost friendly...
Toyota/Lexus has the capability to produce cars that don't need tech like failing sensors, Brakes, Buzzers and Ding Dongs and have a superior car. The EPA/Government has there way with manufacturers, I don't like that...