Re: oil for lower leg
Since it is older, you may use standard Marine Gear Oil for manual shift motors. Any TCW-III 2 cycle oil is acceptable as well.
You may of course use synthetic versions of the gear and 2 cycle oil, but they are more expensive. The synthetic or synthetic blend 2 cycle oil may smoke a bit less, than regular oil, however, IMO it is marginal, and not worth the cost difference.
I use whatever TCW-III oil is available and cheapest.