OK to use motorcycle oil in outboard?

[stickerbush]

I'm currently using Suzuki Ecstar V7000 10W-40 in my DF20A outboard. It is a semi-synthetic, API SJ. I have a couple of Suzuki motorcycles in which I use Ecstar R9000 full synthetic 10W-40 API SL. Is there any reason I shouldn't use the motorcycle oil in the outboard if that's what I happen to have on hand?

 

[William01]

I use V7000 10W-40 but it’s made for marine use. To my understanding outboards run colder that automobiles and I assume motorcycles so I’m guessing the oil made for marine use is a different formula. Maybe different additives?