I use Amsoil 10W40W as Honda recommends and Amsoil recommended. Most here however use 0W30W Amsoil. I live in Southeast Texas and maybe bettwer using the 10W40W but don't know. See no nead to go to 0W in my weather. Where you live, the 0W30W may be more recommended, but I stuck with Honda and Amsoil recommendations with my warranty.