My .02 is use what ever you desire but try to stay away from the absolute cheap oil that you run in your old lawnmower. So not only could there be another oil debate there is also the frequency of oil change debate.
I told you I was waiting for an oil thread. I will sit this one out and watch from the sidelines since I don't pre-fill my filter and still use conventional oils; don't want to lead the new member away from conventional wisdom.