# 50 to 1 Gas Oil Mixture: A Comprehensive Guide

A 50 to 1 gas oil mixture is commonly used in two-stroke engines, where the oil and gasoline are premixed before combustion. This article aims to provide a comprehensive understanding of the 50 to 1 gas oil mixture, including its ratio calculation, mixing instructions, recommended oil, and gasoline octane rating.

### Key Facts

1. Ratio Calculation: A 50 to 1 gas oil mixture means that you need to mix 50 parts of gasoline with 1 part of two-stroke oil.
2. Mixing Instructions: To mix one gallon (3.785 liters) of fuel at a 50 to 1 ratio, you would add 2.6 ounces (76.9 milliliters) of two-stroke oil to the gallon of gasoline.
3. Recommended Oil: It is important to use two-stroke outboard motor oil with an NMMA (National Marine Manufacturer’s Assoc.) certified rating of TCW3 for the 50 to 1 mixture.
4. Oil Brands: Some oil brands that have been tested and approved for use in certain engines include Tohatsu Complete Advantage 100% Synthetic Oil and Tohatsu Premium TCW3 Semi-Synthetic Oil.
5. Gasoline Octane Rating: Unleaded gasoline with a minimum octane rating of 87 is necessary for the 50 to 1 mixture, although using an octane rating of 89 is recommended for optimal performance.

## Ratio Calculation

The 50 to 1 gas oil mixture ratio signifies that 50 parts of gasoline are mixed with 1 part of two-stroke oil. This ratio ensures the proper lubrication of the engine’s internal components and prevents excessive wear and tear.

## Mixing Instructions

To mix one gallon (3.785 liters) of fuel at a 50 to 1 ratio, one must add 2.6 ounces (76.9 milliliters) of two-stroke oil to the gallon of gasoline. It is crucial to follow the recommended ratio to ensure optimal engine performance and longevity.

## Recommended Oil

When using a 50 to 1 gas oil mixture, it is essential to employ two-stroke outboard motor oil with an NMMA (National Marine Manufacturer’s Assoc.) certified rating of TCW3. This certification ensures the oil’s compatibility with two-stroke engines and its ability to provide adequate lubrication and protection.

## Oil Brands

Certain oil brands have been tested and approved for use in specific engines. These brands include Tohatsu Complete Advantage 100% Synthetic Oil and Tohatsu Premium TCW3 Semi-Synthetic Oil. Using these approved oils helps ensure the engine’s optimal performance and longevity.

## Gasoline Octane Rating

Unleaded gasoline with a minimum octane rating of 87 is necessary for the 50 to 1 gas oil mixture. However, using an octane rating of 89 is recommended for optimal engine performance. Higher octane gasoline helps prevent knocking and ensures smoother engine operation.

### Conclusion

The 50 to 1 gas oil mixture is a crucial aspect of maintaining the health and performance of two-stroke engines. By understanding the ratio calculation, mixing instructions, recommended oil, and gasoline octane rating, individuals can ensure the proper lubrication and protection of their engines. Following these guidelines helps extend the engine’s lifespan and prevent costly repairs.

## References

1. One Solution for Different Two-Stroke Mix Ratios? – AMSOIL Blog: https://blog.amsoil.com/one-solution-for-different-two-stroke-mix-ratios/
2. OIL & GAS MIXTURE RATIOS | TECHNICAL INFORMATION | TOHATSU North America: https://www.tohatsu.com/marine/na/tech_info/oil_gas.html
3. 50 to 1 Fuel Mix Chart – 2 Stroke Mix: https://2strokemix.com/50-1-fuel-mix-chart/

## FAQs

### What is a 50 to 1 gas oil mixture?

A 50 to 1 gas oil mixture refers to the ratio of gasoline to two-stroke oil used in premixed fuel for two-stroke engines. It signifies that 50 parts of gasoline are mixed with 1 part of two-stroke oil.

### How do I calculate the amount of oil needed for a 50 to 1 mixture?

To calculate the amount of oil needed for a 50 to 1 mixture, divide the total volume of gasoline by 50. The result is the amount of two-stroke oil required. For example, to mix one gallon of fuel at a 50 to 1 ratio, you would divide 1 gallon by 50, which equals 0.02 gallons or 2.6 ounces of two-stroke oil.

### What type of oil should I use for a 50 to 1 mixture?

It is crucial to use two-stroke outboard motor oil with an NMMA (National Marine Manufacturer’s Assoc.) certified rating of TCW3 for a 50 to 1 mixture. This certification ensures the oil’s compatibility with two-stroke engines and its ability to provide adequate lubrication and protection.

### What is the recommended gasoline octane rating for a 50 to 1 mixture?

Unleaded gasoline with a minimum octane rating of 87 is necessary for a 50 to 1 mixture. However, using an octane rating of 89 is recommended for optimal engine performance. Higher octane gasoline helps prevent knocking and ensures smoother engine operation.

### How do I mix a 50 to 1 gas oil mixture?

To mix a 50 to 1 gas oil mixture, first, determine the amount of two-stroke oil needed based on the total volume of gasoline. Then, measure the appropriate amount of oil using a graduated container or measuring cup. Add the oil to a container of gasoline and mix thoroughly by shaking or stirring until the mixture is uniform.

### Can I use regular automotive oil for a 50 to 1 mixture?

No, regular automotive oil is not suitable for a 50 to 1 mixture. Automotive oils are designed for four-stroke engines and do not provide the necessary lubrication and protection for two-stroke engines. Using automotive oil in a two-stroke engine can lead to severe engine damage.

### How often should I change the fuel mixture in my two-stroke engine?

The frequency of fuel mixture changes depends on the manufacturer’s recommendations and the operating conditions of the engine. Generally, it is advisable to change the fuel mixture after every 30 days or after every 50 hours of operation, whichever comes first. Storing premixed fuel for extended periods can lead to fuel degradation and potential engine issues.

### What are the signs of a lean or rich fuel mixture in a two-stroke engine?

A lean fuel mixture (too much air, not enough fuel) can cause the engine to run hot, experience knocking or pinging sounds, and have reduced power output. A rich fuel mixture (too much fuel, not enough air) can result in black smoke from the exhaust, fouled spark plugs, and poor engine performance. It is crucial to maintain the proper fuel mixture ratio to ensure optimal engine operation and longevity.