Yes, it's a 120 force mercuryWhat motor do you have? Force?
87 is what most outboards need. Anything more is a waste of $
There may be a label on the side of the motor, if so it probably says 87.
Good Luck!
DAve
In the US (I have no idea about Peru) the additive package is the same for all octane ratings, all you get is a higher octane, which is of no value in an outboard unless the manual states otherwise (which it does on a few motors).
Premium is E-free in only some regions and stations, and they are few and far between.
There are many self proclaimed miracle products on the market that claim to solve every perceived issue you may have with E-10 fuel, most do nothing, a few may help a little in just a few problem areas. These aren't really needed, but if you plan to leave the motor sit for a long period of time (a month is not a long period of time) use a fuel stabilizer.
You Know: We could go on and on ad infinitum (can you spell redundant?) about the merits or lack thereof of various octane and brands of gasoline and additives. In fact, in previous threads we have!
The fact is this: Force engines are about as simple and old school engineering as you can get. They are not fussy at all and almost anything that burns will not harm them.
If you are going to store it for a long while: The engine simply doesn't care! I have used gas that was five years old and smelled like turpentine.
I regularly leave my gas in the tank over the winter with no additives-- The engine always fires right up the next season.
Bottom line: Use the cheapest gasoline you can find at 87 octane and the cheapest TCW-3 oil.
I burn premium in my pre 1958 Johnson's because I was told that it burns hotter also I seem to use less in these motors as a result (they don't have thermostats)