You should be fine with 91 octane. The higher the octane, the more you engine will like it, but 91 octane is enough for your ES 350.
Yes, you can use 87 octane fuel in a 2009 Lexus RX350. The owner's manual specifies that the vehicle is designed to run on regular unleaded gasoline with an octane rating of 87. While using higher octane fuel may provide slight performance benefits, it is not necessary for the RX350 and will not significantly improve performance or fuel efficiency.
Use 91 octane or higher octane rating premium gas for the 2009 Lexus RX350
Octane TV ended in 2009.
87 octane
The 2009 Lexus IS-350 has a V6 engine.
The 2009 Lexus IS-350 has 24 valves.
The 2009 Lexus IS-250 has a V6 engine.
The 2009 Lexus IS-F has a V8 engine.
The 2009 Lexus IS-F has 32 valves.
The 2009 Lexus IS-250 has 24 valves.
The 2009 Lexus IS-350 is a gas-powered vehicle.
The 2009 Lexus IS-250 is a gas-powered vehicle.