Adam, did you get a manual with your engine?
If not, it would be worth getting one from the web.
The manual will tell you the type of oils you can use (type number).
My Suzuki 4 stroke will run with normal four stroke motor oil used in cars.
You can use any oils which are rated SE, SF, SG, SH or SJ under the API classification system (whatever that is ).
The viscoity rating should be SAE 10W-40, ideally, or if you cannot find this, the following are ok but with a smaller temperature range.
10W-50
15W-40
15W-50
20W-50
cheers
Bob F.