How to Pre-mix Gas & Oil for Outboard Engines

Each outboard engine has a specific ratio of gasoline to oil that is required. It is important to note that some manufacturers have a break-in period where a greater oil ratio is recommended. These specifications are located in the owner's manual. Many newer engines only require a 100:1 ratio, but 50:1 is the most common, and 24:1 is usually recommended during the break-in.

Difficulty:

Easy

Instructions

Things You'll Need

• Calculator or pencil and paper
• Gasoline
• Oil
• Containers to hold gasoline and oil
• Containers to measure gasoline and oil

How to Pre-Mix Gas an Oil for Outboard Engines

1. Break down the ratios to get an idea of how the math will work. The 100:1 ratio is 100 parts gasoline to 1 part oil. The 50:1 ratio is 50 parts gasoline to 1 part oil. The 24:1 ratio is 24 parts gasoline to 1 part oil.

2. Use ounces to make it easy for yourself to measure and calculate. Convert 6 gallons into ounces (one gallon, of course, equals 128 ounces). Use the 6 gallons as a reference because it will make the conversion to pints easier if necessary. Multiply 6 gallons times 128 ounces to get 768 ounces. For the 100:1 ratio, divide 768 by 100 to get 7.68 ounces of oil. For the 50:1 ratio, divide 768 by 50 to get 15.36 ounces of oil. For the 24:1 ratio, divide 768 by 24 to get 32 ounces of oil.

3. Mix the 6 gallons of gasoline with the appropriate amount of oil previously calculated. For 100:1, mix 6 gallons of gasoline with 7.68 ounces of oil. For 50:1, mix 6 gallons of gasoline with 15.36 ounces of oil. For 24:1, mix 6 gallons of gasoline with 32 ounces of oil.

Tips & Warnings

• 128 ounces = 1 gallon 16 ounces = 1 pint 1 gallon = 3.789 liters

• Use the motor oil and gasoline octane recommended in your owners manual.

Resources

• Read this Article in Spanish