I'm buying my 82 year old mom a 2004 es 330 we had traded into a dealership i work for i know cars but haven't owned a Lexus ever this is a clean 1 owner with 48k on it my main concerns were required maintenance such as when the timing chain,valve adjustments if ever,ect i haven't found the manual for that sort and the last part what are the know issues with this car. Thanks in advance MOM WANTED A NEW CAR I TALKED HER INTO THIS SO IF I'M WRONG I' LL NEVER HEAR THE END LOL.