Yep, use 92+ octane all the time. Your car can adjust for lower octane, but it will reduce performance and MPG. In the end, it's not good for the motor. Follow the guidlines per your owner's manual.
As for oil (dyno vs. synth), that's a big debate. Use the blue search button in the upper right hand corner of your screen and use key words such as oil, sythetic oil, etc., you'll find many posts -- hundreds!
There have been some heated debates on this subject, good info and darn entertaining!