You think EU (EU6d) and Australian (NVES) emission standards are more relaxed than US? Your argument proves the opposite, if it was emissions related, they would make their vehicles in EU use 0W-20 as well.Those toyota engineers say you can use 5w30 in places that aren't CAFE standards. It's not going to hurt anything. It probably isn't going to help a lot unless you live in hot climates and putting high loads/speeds on your engine though. As their own documentation states.
Those "Engineers" also say you should change your oil every 10,000 miles and transmission fluids are lifetime. Good luck with that.







