Sorry for the off topic post, but the Toyota and Lexus newsgroups are dead. Since there are plenty of knowledgeable and opinionated people here I am throwing this out for your comments.
Five months ago I bought a certified 2013 Lexus RX350 with 16K miles from the dealer. The first service call is complimentary and that includes an oil change. My dashboard service light came on around 5K miles so I called the dealer to schedule the oil change. They told me this vehicle uses synthetic motor oil and recommended oil change intervals are 10K miles. I looked in the service manual and sure enough that's true.
In my Toyotas I would change the oil at 5K miles using conventional oil. It makes me somewhat nervous to go 10K miles between changes but I guess synthetic is that much better and doesn't get dirty or break down. I've reached the 10K mile point and am going in today for the service.
The next oil change will be done by myself. Does anyone else use synthetic motor oil and how long do you go between changing it? What brand do you use?