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0w40 and 0w16 should both be the same when cold, because they're both 0 winter weight. Honda's Green and NEXT oils are less than a 0w when cold and thus are good for winter, but the oil analyses I did suggested increased wear with them over Mobile One, so I switched back.
5w30 in an engine which has the tolerance for 0w16 is probably a bad idea. Maybe it doesn't sound different, but the thicker oil might not be able to get into the bearings as well, causing increased wear and premature engine death, seen as higher operating temperature and marginally worse fuel economy.
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