Well, I've done a ton of reading and I believe Amsoil is the way to go...at least Mobile 1 syn....what I hope to gain is an extended drain interval and a little saving of money. I went with the ASL 5w30 from Amsoil. It has a 7,500 or 6 month drain interval.
I saw your reply to the "Everything You Ever Wanted To Know, about motor oil" thread.
After all that data you said "Excellent? No, it's just generic engine oil information that is not necessarily applicable to Asian car manufacturers. For example, the article says: "Very few manufactures recommend 10W-40 any more, and some threaten to void warranties if it is used." . But the facts are even for the 2005 models, Nissan says 10W-40 is fine for temps above zero degrees http://www.saber.net/~monarch/nissan.jpg and Hyundai even approves of the use of 10W-50 http://www.saber.net/~monarch/hyundai2.jpg "
You didn't even address all the great data that proves sythentic is superior to conventional oil.
Please explain your line of thought....I'm open to learning if you got something to teach me other then the fact that Toyota doesn't recommend exceeding their interval.