I would like to know the answer to this, too! Have the same model and year, and need tires now. I do not want run flats. Looking at Michelin Energy Saver A/S and Continental Pure Contact. Suggestions?
I have a 2007 and a 2009 GS350. Both have timing chains. Not sure why your seller suggested Lexus went back to a timing belt in 2007. That is not true in my case (thankfully).