This topic has been beat to death and a search would show the numerous threads started about which oil to use & all the debates. But I'd say most people will just end up telling you a good but cheap oil will be the 5QT jug of Mobil-1 synthetic 15W50 that you can get at Walmart for about $25. That's what I use along with the HD oil filter due to it having the 30 micron filtering for the EVO engines. All the other filters that will fit use a lower 5 or 10 micron screen that essentially send the filter into by-pass mode and do not end up filtering you oil.
Sorry for the bump and my apparent noobishness, but I'm asking for oil with climate conditions in mind, being that my dad and I live in the Philippines. Does it have to do with lubrication choices?