I have a 2009 Suzuki Grand Vitara with a 3.2 V6. It calls for 5w30. Was looking @ some alternative viscosities. Just wondering if anyone had any opinions. Was looking at a 20 weight oil. Keep in mind i am Canada so the cold winters would be a factor. I change my oil twice a year. I'm currently using Amsoil Signature Series 0W30 with their filter. Any help would be greatly appreciated!