I've had my oil changed there at the place at Rio, they do an okay job but they always make me nervous, those Jiffy Lube like places.
I use LXT Automotive its off of Montrose Rd on the east side of 355. The owner's name is Nelson, real good guy tell him Steve Withrow sent you. Their number is 301-881-4033.
He has been a Lexus master tech for like 16 years, used to work for Lexus of Silver Spring. Real nice guy. The shop isn't much to look at, but they do good work quickly and they are very reasonably priced.
He can do ALL your service stops and do just as good a job as the dealer, uses all OEM parts, etc.