It depends if it is a 2 stroke or a 4 stroke.
A 2 stroke engine, you mix the gas and oil.
A 4 stroke engine, there are separate tanks for the oil and gas.
50-1
A 175hp Mercury outboard requires a 50:1 fuel to oil ratio.
50:1
The 1978 model, 75 hp Mercury outboard, requires a 50:1 ratio, roughly one pint of 2 cycle oil, to six gallons of fuel.
To create a 50:1 oil mixture for 1 imperial gallon of gas, you would need approximately 2.5 ounces (about 75 milliliters) of two-stroke oil. This ratio means for every 50 parts of gas, you mix in 1 part of oil. Since there are 128 ounces in an imperial gallon, dividing that by 50 gives you the amount of oil needed.
OMC recommends 24:1, UNLESS it's a Johnson oil "TCW-III". Then you can get away with 50:1, no problem.
The 1996 75hp Mercury outboard motor can be tricky to care for in terms of fuel mixing according to some users. The recommended mixture has seemed too weak for many owners, and currently the recommended ratio stands at roughly three ounces of oil to each gallon of gas. As with all small engine calibration, it is best to adjust according to need.
The Stihl TS410 concrete saw typically requires a gas-oil mixture of 50:1, which means mixing 2.6 ounces (or 75 mL) of Stihl two-stroke engine oil with one gallon (or 3.8 liters) of unleaded gasoline. It's important to use high-quality oil specifically designed for two-stroke engines to ensure optimal performance and longevity of the machine. Always check the user manual for the most accurate specifications and recommendations.
If the horsepower of your Mercury outboard lower unit is 75 and below, SAE 80W90 Gear Lube is recommended.
When MIG welding STEEL a mixture of Argon -- CO2 is used. 75% - 25%
The 1980,s model, 75 hp Mercury outboard, requires a 50:1 ratio. This is roughly one pint of 2 cycle oil, to six gallons of fuel.
My 75 Johnson is 50:1. If you use a synthetic oil you won't need to worry about it and no more smoke from too much oil