Also worth noting, pertaining to your concerns about not overheating in hot weather: Synthetics will handle much higher temperatures before breaking down and losing some of their lubricating ability. The point at which normal oil can experience viscousity breakdown is alarmingly close to the operating temperatures of some high-performance engines... The point at which synthetics break down, however, is so high that pretty much as long as your engine isn't melting, your oil is still good <img border="0" title="" alt="[Smile]" src="images/icons/smile.gif" />

Synthetic oil is pretty much superior in all ways imaginable.