yes it has one
50:1
The 850 model, 85 hp Mercury outboard, is a 2 stroke engine requiring a 50:1 fuel to oil ratio.
NO! definitely a 2 stroke and requires oil in gas.
Its 4 stroke so 100:0
whereiscrank case oil drain plug on 1998 mercury 9.9 4 stroke
5w-30
50:1
Web site never did answer the question.
No. There is a oil tank much like your car that you top off.
This question is like comparing Mercury to Evinrude, it would depend on personal preference. Generally, any brand name, TC-W3 rated 2 stroke oil, blended for outboard use will work. It is also a good idea not to mix different brands of oil in the oil tank of oil injected engines.
The non oil injected, 2 stroke model, 70 hp Mercury outboard requires a 50:1 ratio, one pint of 2 cycle oil, to six gallons of fuel.
No, not a good idea to use vegetable oil. Use a TC-W3 rated, 2 stroke outboard oil blended for outboard use.