I think it 10w30
It depends on what year it is.
50 : 1 is the correct fuel mixture
A 3.3 hp Mercury outboard for 2007, requires a 50:1 fuel to oil mix. This is roughly 1 pint of 2 cycle oil, to 6 gallons of fuel.
where is the drain oil plug on a 2010 9.9 mercury outboard motor
what type oil to use on 4stroke 2.5mercury outboard
I have a 1999 Mercury 2stroke 5HP outboard and the owners manual states 50:1 Gas/Oil mixture.
A 175hp Mercury outboard requires a 50:1 fuel to oil ratio.
2%
If manufactured after 1965, an 80 hp Mercury outboard requires a 50:1 fuel, to 2 cycle oil ratio.
The 1973 model, 7.5 hp Mercury outboard, requires 6.8 oz. of gear oil.
A 4hp Mercury outboard requires a 50:1 fuel to 2 cycle oil mix.
An 1985 model, 25 hp Mercury outboard requires a 50:1 fuel, to 2 cycle oil ratio.