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The ideal choice for transmission fluid in a 2009 Lexus RX350 is Toyota genuine ATF WS. It's recommended to have the fluid replaced every 30,000 miles to maintain the transmission's longevity. Over time, due to heat and aging, the fluid's viscosity can decrease, potentially leading to transmission slipping issues. The RX350's dipstick can be found on the driver's side of the engine compartment below the cover. Changing the filter can be quite challenging, especially for those without mechanical skills. If you’re not confident in your abilities, consider having the dealership handle it, although some may refuse to perform the task.
The 2009 Lexus RX350 requires a DEXRON VI automatic transmission fluid.
For 4WD models with automatic transaxle transfer, the fluid capacity for draining and refilling is 3.7 quarts (3.5 liters, 3.1 imperial quarts) of Toyota Genuine ATF WS fluid.
Thanks a lot
According to the factory specifications, the ATF Type III-H is the transmission fluid recommended for the 2009 Lexus RX350.