Try this site - http://www.marineengine.com/mfr/mariner_outboard.html
50to1
A 175hp Mercury outboard requires a 50:1 fuel to oil ratio.
A 4hp Mercury outboard requires a 50:1 fuel to 2 cycle oil mix.
If it the Yamaha import it 100:1 and if late model Mercury built it s 50:1
Usually 50:1. Use a good quality, brand name oil that has been blended for marine use.
Yes
From the oil you mix in with the gas
50:1
50to1
The model year is 1985 and the fuel ratio is 50:1
Mariner 3.3 needs 50:1 mix.
yesw 16 to 1