Thanks for the information guys. We don't have any Ultramar stations in my area, but I have seen them before. However, this was the first time I have seen their oil, and I was just curious of the quality of oil the typical boater is getting at this marina.
The bottle of oil said that it was manufactured in Canada. The spec sheets are kind of vague, and don't even list the TBN values. The 5W30 is a thick 11.9 cSt at 100*C though. Mind you these are the SJ spec sheets and the marina is selling SL oil. In any case, I bet the many big boats running small and big block Chevy V8's at this marina could use a better oil than this expensive Ultramar 10W30.
The 2 cycle doesn't look that great either. I run an outboard on my boat and I have been using Pennzoil Outboard oil for the last couple of years. According to the spec sheets the Pennzoil has a 9.53 cSt at 100*C while the Ultramar is only 5.9 cSt. I think I will stick with the cheaper Pennzoil.