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Well I don't mean to be rude but I am posting in the IS 2nd generation section and the 250 and 350 have identical schedules.
I have an 08 IS350
I don't mean to be rude, but indicating model year helps people know if the car is still under warranty. If I was rude, I would tell you to read the manual since you have already noted "identical schedules", so you must have the maintenance schedule.