jaykchan wrote:
Seem like the internal oil reservoir is all I
have. Does this mean that the internal-link-to-external-oil-tank
combo is only for very large outboard?

Yes. For the V6.

Does this mean that my 115hp
outboard probably is too small for an external oil tank?

Yes.
..... same for a 125hp.
They're both inline 4 cylinder engines with only an internal oil tank.
No external tank.

Rick