delZ
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Generation refers to years in a way (ES350 07-09 is considered generation 5) U39 refers to the update You can use the one that you mentioned since that's the lastest one right now for the 07-09 ES350.
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Sometimes Lexus dealers will do things to your older car to make a new car more appealing to you. For example , my car rode noticeably worse when a dealership decided it was ok to set the tire pressure to 40 PSI on the four main tires (and 45 PSI on the spare) when the car specs says that the pressure should be 30 PSI.
