Yup, standard because plugs difficult to access. My wife's forester sama sama........lolCorrection : Nissan STD uses iridium plugs as standard. NGK supplies Tan Cheong Malaysia. In Singapore it's Denso.
No la. Gpower doesn't give you any improvements other than perhaps a smooth feel for your acceleration just like how Iridium feels. And personally I hate GPower. It's not as long life as Iridium and the damn thing was fragile. Broke one in my Wira back then from heat.
As for plugs, depends on luck lah. My VR never blew any normal plugs nor platinum ones but burn one set Iridium and the next set one piece the ceramic broke off. I use Iridium just to try out colder plug where I cannot get for normal and platinum, but was expensive lesson.....lol