Re: which oil is best
Alot of guys here use the Wal Mart brand some only use the high dollar factory oil, I have used Speedway branded oil for years with no problems.
The important thing is to be sure it is TCW-3 rated, that is specific to outboards and don't run weedwhacker oil, they run at a much higher temp and the oil is different.
So, don't get stuff that is a buck on clearance but you don't need to spend $12 a quart either.
A 93 should be 50:1 but I am not a Force guy so wait for a qualified answer on that.