
Husqvarna chainsaws use two-stroke engines, which require the user to mix oil into the fuel at a predetermined ratio to ensure the engine receives adequate lubrication during operation. The ratio that is used when mixing two-stroke oil and gasoline is very important, as inaccuracies will cause the chainsaw to not run efficiently. This article will cover the correct ratios and steps to mix two-stroke oil and fuel for a Husqvarna chainsaw.
| Characteristics | Values |
|---|---|
| Type of oil | Two-stroke oil |
| Type of fuel | Unleaded ethanol-free gas |
| Fuel/Oil ratio | 50:1 (2%) |
| Oil amount per gallon of gas | 2.6 oz. |
| Fuel container | Clean, airtight |
| Fuel storage | Less than one month |
| Fuel stabilizers | Can be added to extend shelf life |
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What You'll Learn

The correct ratio of oil to fuel is 50:1
Husqvarna chainsaws use a two-stroke engine, which is unique in that it does not have an internal oil reservoir. This means that the owner must mix oil into the fuel at a specific ratio to ensure the engine receives the correct lubrication during operation.
The correct ratio of oil to fuel for Husqvarna chainsaws is 50:1. This means that for every gallon of gas, you will need 2.6 oz of two-stroke engine oil. It is important to get this ratio right; too much oil and the engine may struggle to start or run, and there may be carbon buildup or excess smoke. Too little oil and the engine may overheat and sustain permanent internal damage.
When mixing the fuel, always use a clean, airtight container intended for fuel. Start by filling the container with half the amount of petrol to be used, then add the entire amount of oil. Shake the mixture, then add the remaining petrol. It is important to note that you should never mix fuel and gasoline in the tank of the chainsaw. You should also never smoke while refueling or mixing fuel.
It is recommended that you use genuine Husqvarna two-stroke oil for the best performance, and that the mixed fuel is used within 30 days.
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Use unleaded ethanol-free gas
Husqvarna chainsaws use a two-stroke engine, which is very different from a car engine. Two-stroke engines do not have an internal oil reservoir, so oil needs to be mixed with the gasoline. The gasoline used in two-stroke engines needs to be of a certain quality, with a particular octane level and ethanol percentage.
Husqvarna recommends using unleaded fuel with a minimum octane rating of 89 and a maximum ethanol content of 10%. Using the wrong type of gas in your chainsaw can damage the engine. It is important to note that ethanol naturally attracts moisture to the fuel system, which can cause issues with your Husqvarna chainsaw. Gasoline can begin to break down as soon as a month after purchase, losing some of its combustible properties. The water and ethanol mixture can also leave behind varnish and gummy deposits that will restrict fuel flow and corrode components.
Therefore, it is recommended to use unleaded ethanol-free gas for your Husqvarna chainsaw. Husqvarna offers a pre-mixed fuel that is ethanol-free and ready to use. If you are mixing your own fuel, always use a clean, airtight container intended for fuel. Start by filling the container halfway with unleaded ethanol-free gasoline, then add the entire amount of two-stroke oil. Shake the container to mix the fuel and oil together, and finally, add the remaining amount of gasoline.
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Don't use oil intended for water-cooled engines
Husqvarna chainsaws use two-stroke engines, which require the owner to mix oil into the fuel at a predetermined ratio to ensure the engine receives adequate lubrication during operation. When mixing fuel with two-stroke fuel oil, it is important to get the ratios right. Using too much oil can cause the engine to struggle to start or run, generate carbon buildup, blow clouds of smoke, and generally perform poorly.
Two-stroke oils are not all the same, and it is important to use the right type for your engine. You should never use two-stroke oil intended for water-cooled engines in a non-water-cooled engine. This oil is sometimes referred to as outboard oil (rated TCW) and is designed for use in marine applications such as boats. While it may be tempting to use this type of oil in your chainsaw, especially if you have some on hand, it is not recommended.
Air-cooled 2-stroke engines, such as those found in chainsaws, are subject to different conditions than outboard engines. While using synthetic TC-W3 oil in your chainsaw may not kill it immediately, there is a reason why outboards and chainsaws call for different oils. Chainsaws typically operate at higher RPMs and temperatures than outboards, and using the wrong type of oil can lead to performance issues and even damage to the engine.
It is always recommended to use an FD-approved 2-cycle oil in air-cooled lawn machines, which is typically blue in color. Using other types of oil, such as regular TC-W3, can void the warranty on your chainsaw. In addition, it is important to avoid using oil intended for four-stroke engines, such as motor vehicle oil, as this can also lead to performance issues and maintenance problems over time.
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Don't use four-stroke engine oil
Husqvarna chainsaws use two-stroke engines, which have several unique features that distinguish them from four-stroke engines. Two-stroke engines, for example, lack an internal oil reservoir. Instead, they require the user to mix oil into the fuel at a predetermined ratio to ensure the engine receives sufficient lubrication during operation.
When mixing fuel and oil for your Husqvarna chainsaw, it is important to remember not to use four-stroke engine oil. This includes motor vehicle oil, which is designed for four-stroke engines with different lubrication requirements. Using four-stroke engine oil in a two-stroke engine can lead to several issues:
- Four-stroke engine oils, particularly those made from a natural petroleum base, can leave behind heavier deposits than synthetic oils. Over time, this can result in a buildup of burnt carbon or gummy residue on the piston, requiring more maintenance and potentially impacting performance.
- Using four-stroke engine oil in a two-stroke engine can also compromise performance and cause the engine to struggle to start or run properly. This may lead to issues such as carbon buildup and excessive smoke.
- Four-stroke engine oils are designed for engines with different components, such as valve trains, timing gears, cams, and pushrods, which are not present in two-stroke engines. Therefore, using four-stroke oil may not provide the necessary lubrication for the specific moving parts in a two-stroke engine.
- Mixing four-stroke engine oil with fuel for a two-stroke engine can be dangerous. It is important to store and handle fuel mixtures properly to avoid confusion between two-stroke and four-stroke fuel mixtures, as using the wrong mixture can damage the engine.
In summary, it is important to use the correct type of oil for your Husqvarna chainsaw's two-stroke engine. Always refer to the product's owner's manual for the recommended fuel-to-oil ratio and specific oil type to ensure optimal performance and prolong the life of your chainsaw.
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Too much oil will cause engine issues
Husqvarna chainsaws, like other chainsaws, require the right amount of oil to be mixed with fuel at a predetermined ratio. This is because two-stroke engines, unlike car engines, do not have an internal oil reservoir. The absence of oil can destroy the engine, as lawnmower service expert Nancy Egelhoff points out. However, too much oil will also cause engine issues.
When there is too much oil in the gas mixture, the chainsaw may start, but it will lack power and turn itself off. The engine may struggle to start or run, generate carbon buildup, blow clouds of smoke, and generally perform poorly. This can lead to a loss of power and even cause the chainsaw to shut down. The excess oil can also cause a smoky exhaust and oil leakage from the muffler.
The correct ratio of fuel to oil is essential for the optimal performance of a chainsaw. A ratio of 50:1 is often recommended, but some older two-cycle engines may require a ratio of 20:1. It is important to consult the owner's manual or seek advice from a professional to determine the appropriate ratio for your specific chainsaw model.
Using the wrong type of oil can also lead to engine issues. For example, using oil intended for four-stroke engines, such as motor vehicle oil, in a two-stroke engine can cause problems. Additionally, used motor oil may contain contaminants from the crankcase that are harmful to both the environment and your health. It is always best to use oil specifically designed for chainsaws, such as bar oil, to ensure optimal performance and minimize potential issues.
In summary, while it is crucial to ensure that your Husqvarna chainsaw has sufficient oil, adding too much can lead to various engine issues. Always refer to the manufacturer's guidelines or seek expert advice to maintain the proper fuel-to-oil ratio and choose the right type of oil for your chainsaw.
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Frequently asked questions
The recommended fuel/oil ratio for Husqvarna chainsaws is 50:1. This means that for every gallon of gas, you will need 2.6 oz of two-stroke engine oil.
Husqvarna two-stroke engines require a two-stroke oil designed for high-performance, air-cooled two-stroke engines. Do not use oil intended for four-stroke engines or water-cooled engines.
While a richer mix of oil will run in the chainsaw, it is not recommended as it can cause excessive smoke, foul the spark plug, and clog the spark arrestor. Stick to the recommended 50:1 ratio to avoid these issues.
Always use a clean, airtight container intended for fuel. Start by filling half the amount of petrol to be used, then add the entire amount of oil. Mix the fuel and oil by shaking the container, then add the remaining petrol.
Mixed two-stroke fuel should be used within 30 days from the time it was mixed to ensure stability and combustibility. Avoid storing it for more than one month. If you need to prolong its life, you can add fuel stabilizers to extend its shelf life up to twelve months.











































