Ok, let's hear it. What brand of oil do you use and why? Here's is order of what I would use if one or more options were not available.... 1997 mercury sable Mobil Clean 5000- Cheap major label conventional oil and Grandpa bought shares of Exxon 40 years ago. Just padding my inheritance. Super Tech- Cheapest oil. If it protected any less then name brand oils and ruined engines, I'm sure we would have heard of it by now. Pennzoil- because I like the color of yellow on the bottle Quaker State- color green is cool, but doesn't catch my eye like pennzoil Castrol- green not as stand out ish as quaker state and white bottle, well, it's just white. Valvoline- see previous line for views on white bottles. Havoline- black is boring For my motorcycle 15w40 Delvac- because of previous mentioned stock interest. 15w40 Rotella- name brand 15w40 or 20w50 super tech- I say I believe in super tech, but I can't bring myself to put it in my motorcycle just yet. For my car oil is oil. For motorcycle, I use name brand oil for no other reason then it makes me feel better.