Official toyota recommendation for 2010 engine oil

Dealer oil change at 129611 miles- glancing at invoice before throwing it away I notice "installed 00279BLK1601 : oil : 0W16." What? 0W20 has always been used. I called Toyota customer service and after a long complicated confusing conversation filled with circular logic, doubletalk, legalese and evasive bafflegab I was finally told that "Toyota Motor Company's official position is that 0W20 motor oil should be used in this car" Customer service must have barked at the dealership because a half- hour later I found a panicky voicemail from the service manager telling me that they had put the wrong oil in my car and that I should come back "at my earliest convenience" so they could change the oil. I had never heard of 0W16 before this but a quick swipe at the internet found a few million people who think the stuff is great and that we should all dump it into every internal combustion engine we own. I plan to keep this car until I die so I want to do my best to make it last. What oil do you all think I should use?