Recently purchased an '06 GS300 with 100K miles on it. Has every oil change and scheduled maintenance record since new and all work done by Lexus. so I decided to go ahead and have the 105K service to make sure everything was still in check and maintenance up to date. When we purchased it, I thought the front wheel bearings were making noise but according to Lexus of Portland, it's just the new Toyo Tourevos as a few of you said it would be (sounds like Alaskan Air flight #2311 on a 737 airplane). They corrected a couple recalls, tightened a few bolts, and changed the oil with 5-30 Mobile 1 full synthetic. I don't get to the valley very often where the dealer is, so trying to stretch out the oil changes. The low oil light came on about 30 miles before we got to the dealer, which was concerning. They noted it was roughly 1-2 quarts low and told us to keep an eye on it.
I haven't seen many '06's with the miles mine has and just currious if the oil consumption is "normal" or if I should start looking for something with less miles. The dealer didn't report any oil in the water or leaks so I guess it's just eating it?? Also, what can I do about these noisy a$$ tires.......they are brand new Toyo Toureveos on factory 17's. Considering going with the GS430 18's, so new tires would be an option.
Overall, car is tight. Looks, drives and performs like new. Seats are a bit unconfortable for both me and my wife (miss the Volvo seats) but not bad for a Toyota. Lexus of Portland is a top notch outfit, and we were treated very well. Although it's a 200 mile round trip, they will be getting all of our business.
FYI 105K scheduled maintenance with 5-30 mobile 1 synthetic oil/filter change ran us $148

 

Just a thought...maybe your LOF was short a quart? As this has happened to me a handful of times with various cars by various mechanics (usually dealership mechanics), I make it a habit to check the dipstick when I get the car back from being serviced.

As for the noisy tires, balancing...alignment are OK?? Maybe a rotation will help.

 

When I had my factory rims, everything was fine and I had no noise until I had to buy 2 brand new michellin tires (not sure of the model) for the front and as soon as I drove away I immediately noticed nosie.. I automatically assumed that it was a bearing or something cuz I had just hit a crazy crazy pot hole (which is the reason I brought two new front tires cuz I caught a flat)... So I took it to the dealer for a front end check and they told me that everything was ok and everything was working properly... They also noticed the noise and told me that it was the tires making that noise because the thread pattern on the tire was too rough for the car ( watever that's suppose to mean), they told me I needed smoother tires for the Gs or it won't ride or sound like it's suppose to... I put my 22s on wit brand new "smoother tires" (according to them) and the noise completely went away...so to me, it sounds like the tires u have are "too rough"... I would try some different tires and see wat happeneds.. Sorry bout the long story