No , not according to the Gates website ( they make timing belts etc . )
20/1
The 1977 model, 20 hp Mercury outboard, requires a 50:1 fuel to oil ratio.
The dry weight for a 1988 model, 20 hp Mercury outboard is 105 lbs.
Pump, fuse, or fuel pump relay.
The 20 hp Mercury outboard requires a 50:1 ratio, roughly one pint of 2 cycle oil, to six gallons of fuel.
50:1. 16 ounces oil to 6 gallons gas
the 20hp Mercury outboard motor runs at the most at 8mph on a good 14ft to 16ft aluminum boat. Mercury.co
The weight of a 1979 70 HP Mercury outboard with 20 inch shaft, power tilt and trim is 239 pounds. I would expect the somewhat newer motor to weigh about 5-10 pounds more. Hope this helps.
The 1999 Mercury Mystique wiper blade sizes are 22" drivers and 20" passenger side wiper blades. See Sources and Related Links below for more information. Since there are over 22 different wiper arm attachments, do not buy wipers just by length only. Be sure to lookup exact wiper blade part numbers by vehicle make, model and year for the brand wiper you decide to purchase. This ensures correct length AND correct attachment.
If it runs perfectly, starts easy, etc, probably around $700-$1000. If something is broke and/it is missing parts or incomplete, $200-$400 as a parts motor.
The gas to oil ratio is 50 to 1 50: 1 I have the same motor, good luck
5w-30 is what I use in my 2000 grand marquis, in 2001 ford started saying 5w-20.