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All Models of Bolens Weed Eater Fuel Mix Ratio Here!

What is the recommended fuel mix ratio for a Bolens weed eater? If we answer this question straight, the recommended Bolens fuel mix ratio is 40:1. This proportion ensures the smooth running and prolonged life of the Bolens weed eater machine.

weed eater machine

But why is maintaining this fuel mix ratio so important? It plays a crucial role in the overall performance and lifespan of your weed trimmer — understanding this aspect will help you get the most out of your equipment. There are also alternative options for fuel mix ratios as well, but having a deep knowledge of these factors is essential to maximize efficiency.

So, let’s dive into this topic and grasp the facts to ensure optimal performance from your Bolens weed eater!

Bolens Weed Eater Fuel Mix Ratio

Most weed eaters, including Bolens models, utilize two-stroke engines that require a proper mixture of oil and gas to ensure optimal performance. However, some four-stroke Bolens weed eaters do not need an oil and gas mixture, as they have separate fuel and gas tanks.

Does this fuel mixture ratio vary for different models? Not very much.

The majority of Bolens weed eaters, such as the BL100, BL110, BL150, and BL160 models, perform well with a 40:1 gas-to-oil ratio. This means you must combine 40 parts of gas with one part of oil — for example, if you use one gallon of gas, add 3.2 ounces of oil.

Occasionally, manufacturers recommend a 50:1 gas-to-oil ratio, which also functions effectively — you would want to check with your particular model.

Below is a table displaying the recommended fuel mix ratios for different series of Bolens weed eaters:

Bolens Weed Eater ModelsGas-Oil Fuel Mix Ratio
Bolens BL10050:1 or 40:1
Bolens BL11040:1
Bolens BL15050:1 or 40:1
Bolens BL16040:1

How to Measure Fuel Mixture?

Measuring the 40:1 fuel mixture for a Bolens weed eater is simple:

With one gallon of fresh gasoline, add 3.2 ounces of oil. Alternatively, if using one liter of gasoline, mix in 25 ml of oil.

For a 50:1 fuel mixture ratio, combine one gallon of gasoline with 2.6 ounces of oil or 20 ml of oil for one liter of gasoline.

Another gas-to-oil mix ratio you might have heard about is 32:1, which is typically used in older weed eater models. If that’s the case, mix 4 ounces of oil with a gallon of gasoline — or 31.25 ml of oil for 1 liter of gasoline.

Related: Does It Hurt To Use 32:1 Mix in Place of 40:1?

Here’s a handy table for you to use:

Mixing Ratio (Gas:Oil)Volume of Gasoline, gal./lVolume of Oil, oz./ml
32:11 US gal./1l4 oz./31.25ml
40:11 US gal./1l3.2 oz./25ml
50:11 US gal./1l2.6 oz./20ml

By following these guidelines, you can ensure the optimal performance and longevity of your Bolens weed eater.

Here is a helpful video tutorial on how to mix gas and oil for a weed eater:

Why Is It Important to Maintain Fuel Mix Ratio?

When it comes to the performance and longevity of your weed eater, the importance of maintaining the correct fuel mix ratio cannot be overstated.

Two-cycle engines, commonly found in weed eaters like the Bolens BL110, use a string as a weed trimmer. This design requires lubrication through a mixture of gas or fuel and oil.

Essentially, the Bolens weed eater fuel mixture serves to lubricate critical components, such as the piston and crankshaft.

An incorrect ratio can lead to service and longevity issues, while a proper gas-oil blend ensures efficient engine operation. For instance, over-adding oil to the mixture can also result in engine problems. Conversely, using too little oil can severely decrease the engine’s lifespan

As such, keeping an eye on the recommended fuel mix ratio is vital for optimal performance and ensuring that your weed eater remains functional for an extended period. By adhering to the manufacturer’s guidelines, you can avoid common engine issues and enjoy a more efficient weed trimming experience.

Important Note:

It’s crucial to emphasize the role of using fresh oil within the gas-oil ratio.

Even with the correct fuel mix ratio, utilizing expired oil or oil older than six months can negatively impact your weed eater’s performance. Fresh oil is essential for achieving optimal results and maintaining the engine’s health.

Additionally, avoid using automobile motor oil in any weed eaters, including Bolens models. Motor oil contains non-combustible additives that can potentially damage the engine. 

Adhering to the recommended gas-oil ratio is vital, but it’s equally important to use fresh oil and avoid unsuitable alternatives like motor oil.


What kind of gas does a Bolens Weed Eater take?

When it comes to fueling a Bolens weed eater, regular unleaded gasoline is the recommended choice.

Modern-day gasoline often consists of a blend of gasoline and alcohol. For optimal performance in your Bolens weed eater, use 87 octane fuel with less than 10% alcohol content.

It’s worth noting that if you choose to use alcohol-blended gasoline, ensure it is not older than 60 days. Fresh fuel is essential for maintaining the efficiency and longevity of your weed eater’s engine.

How much oil do I mix with gas for my weed eater?

Typically, weed eaters require a gas and oil mixture in either a 40:1 or 50:1 ratio.

To achieve a 40:1 ratio, you should add 3.2 ounces of oil to one gallon of gasoline. Alternatively, for a 50:1 ratio, mix 2.6 ounces of oil with one gallon of gas.

Using an improper fuel mix ratio can result in fouling the weed eater machine, which may lead to decreased efficiency and potential damage. By adhering to the recommended ratios, you can prevent engine issues and enjoy a better trimming experience.

What is the ratio of 40 to 1?

A 40:1 ratio is commonly used for two-cycle weed eater machines, which require a gas and oil mixture to maintain proper lubrication of the piston and crankshaft. This mixture ensures optimal performance and extends the engine’s life in weed eaters, such as the Bolens BL110.

This 40:1 ratio indicates that one part of oil should be mixed with 40 parts of gasoline

Following this ratio is crucial for maintaining the health and efficiency of your weed eater’s engine.


Maintaining the proper Bolens weed eater fuel mix ratio is essential for ensuring optimal performance and longevity of your weed trimmer. By keeping a careful balance between gas and oil, you can enjoy uninterrupted use of your machine for an extended period.

In addition to adhering to the recommended gas-oil ratio, it’s also crucial to use fresh oil and the appropriate gasoline. These factors play a significant role in the overall performance and health of your weed eater’s engine.

Bolens weed eaters are fantastic tools for shaping and maintaining your lawn or garden according to your preferences. Trimming becomes a smooth and effortless task when the gas-oil ratio is kept perfect.

So, here’s to happy garden trimming with the correct use of your Bolens weed eater!

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