My local Lexus dealer, Superior Lexus in Kansas City MO, says they use Quaker State Synthentic Blend oil when they do oil changes. I am not sure if that is true for all Lexus dealers. I have not been able to find that particular type of Quaker State oil at my local auto parts shop here in K.C., but I am probably just not looking hard enough.
It might be a good idea to see what kind of oil was used by the previous owner, if you can, so you can continue to use that same kind. It is really pretty easy to do the oil/filter change on these cars if you have a little mechanical ability and some basic tools. You can save yourself a lot of money if you don't mind spending a short amount of time doing the work.
Thanks for the response and I will see what I can find out and keep the oil types consistent. This is the first Lexus for me. I have owned several Infinity's and have been pleased with them. This car will be used mainly for business travel so I didn't want to buy a new one and lose the depreciation for the mileage I travel. If I like it I plan to upgrade my wifes Infinity to a newer model in a year or two.