I know this will open another can of worms here...but

Brison says that it's OK to run synthetic oil from day one whereas many people who have been running gas engines suggest to run petroleum based oil for a couple of gallons before switching to all synthetic.

In fact, I think BME recommends the latter too. Now I am not saying that people on my flying fileld know more than the guys at Brison, but this actually gets to be a bit confusing.