Well, just took the plunge and bought our first BMW. I have spent the last several hours researching here on the oil. So far, here is my findings: 1. Factory fill won't go 15K miles 2. Castrol 0W-30 SLW may be a really good way to go 3. I need to change more often, but not reset computer. OK, I am looking for recommendations on oil for my changes. I am leaning to the Castrol 0W-30 (SLX-Green stuff ) but don't know where to find it or what the bottle looks like. Thanks for any input.