oil for a 115 4 stroke

[X17xpress]

would synthetic oil work good in a 4 stroke, Fixing to change mine and was wondering which oil would be best to use

[Musky Mike]

I use Royal Purple syn. oil in my 2004 F150 with no problems. The only syn. FC-W for your 2007 that I know of is Amsoil (must use a FC-W to maintain warranty.) My engine took 50-75 hours to break-in. Unless you put a lot of hours on your engine, I would do the 10 hour oil change with dino oil and go to syn. after the first year.