I've tried most of the mainstream oils over the last 208,000 miles and came back around to toyota OEM which the local dealer sells to me for the same price as M1 at wall mart.

I have noticed the engine stays quieter longer with Toyota oil. Every time i pull into my garage I always listen to my engine for a few seconds before shutting down. Been doing this for 8 years now and I can usually hear when something sounds different like when the ticking gets louder. I also change it every 5-6k despite the 10k recommendation. Run OEM filters and still have the plastic housing and a cheap pennzoil filter wrench with no issues so far.