How much oil to pour into a grass trimmer per liter of gasoline

Gasoline mowers are quite common tools used by owners of garden and homestead farms for mowing grass and making hay. common names for tools are the terms “grass trimmer” and “lawnmower“. The main difference lies in the design of the motor. the expensive segment of the devices is equipped with four-stroke models, and the cheap ones. two-stroke. The latter option has advantages, including low weight, ease of use, and low cost.

The most important condition for the work of two-stroke models is the preparation of the fuel mixture, based on the manufacturer’s defined proportion of gasoline and oil. The simplified design of the motor does not provide a separate channel for lubrication, so engine oil is added directly to the gasoline. Violation of the correct proportion leads to a significant reduction in the resource of the tool and even to its failure. Let’s understand what composition is required for gasoline trimmers, how to properly prepare the mixture and what it can affect.

What to choose oil to fill in the trimmer for grass or types of lubricants

Grass trimmers and lawnmowers are powered by two-stroke engines, which have a simplified design. Rarely, but there are models of trimmers with 4-stroke motors that run on pure gasoline. Power units of two-stroke type have no compartment for filling the engine oil (oil sump), thereby reducing the weight of the tool and their cost. If the rotating parts of the motor are not lubricated, they will fail quickly. To prevent this, the grass trimmer is not filled with pure gasoline, but with a mixture of oil. What oil to dilute with gasoline for grass trimmer?

grass trimmer oils

To begin with, let’s remember or find out what types of oils by chemical composition are produced:

From the above it follows that the grass trimmer oil with any composition. mineral, synthetic and semi-synthetic. Oils with different chemical composition differs in price, so rely on the recommendations of the tool manufacturer when buying. The instructions include advisory information on what types of oils are best to use. If it is standard TC-W3, then the composition of the substance is not so important. In this case, you can dilute mineral, semi-synthetic and synthetic with gasoline.

This is interesting! The main thing when choosing oil do not get caught on the counterfeit, because today you can often find different types of lubricating compositions for two-stroke engines, which consist mainly of low-quality petroleum products.

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Why buy grass trimmers?

Comparing with similar mechanisms, give preference when choosing a brushcutter on the following functional indicators:

  • Mobility and low weight of the unit, allowing to carry it over distances, to use in hard-to-reach places for mowing.
  • Versatility. Lawn mower is equipped with a node for exchanging working elements during the machine operation.
  • Simplicity of design for long life without frequent adjustments.

These, and other positive characteristics, give buyers the confidence that when buying a trimmer for grass, make the right choice.

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What gasoline to fill up

Gasoline for grass trimmer should be chosen unleaded with the tact number 92 or 95. As practice shows, gasoline AI-80 can cause damage to the device, which is a questionable economy.

Fuel must be fresh, i.e. it cannot be stored for more than 60 days after purchase.

Other factors affect the quality of fuel, such as using a special lubricant for lawnmowers and diluting it in a separate container. It is also recommended to use special canisters designed for storing gasoline.

Choosing lawnmower oil

For the engines of trimmers you need to choose oils marked “2T”, which are used for engines with a volume of 50 to 200 cm3 and are air-cooled. In the first place when buying oil you should pay attention not to the price, but the protective properties of the material, because a small savings can later become a real headache for the owner and, as a rule, a big expense.

2-Stroke Lawnmower Oil

The main factor determining the quality of grass trimmer oil is the alkali number. It is this component that prevents oxidation of the moving parts and slows down their breakdown. During use the oil gradually loses its alkalinity and becomes oxidised. The optimum level of acidity (Ph) should not be less than 8-9.

Trimmer oil viscosity also has a big impact on how a petrol tool works. This determines whether the grass trimmer can be operated at different temperatures. For example, summer brands of lubricants become thick even when the temperature falls slightly. As you only use your mower in the spring and autumn, summer grade oil is the right choice.

The flash point of grass trimmer oil must be over 225C, or the oil will burn out quickly and the piston group will be subjected to intensive wear and tear.

What to Pay Attention to When Choosing Oil?

Today’s two-stroke brushcutter engines are fueled with a mix of AI-92 gasoline and “2T” oil. Using fuel with a higher octane number will increase the flash point and, consequently, the burnout of the lubricant.

STIHL oils

Undoubtedly, the best oil for grass trimmer is the one recommended by the manufacturer, but the owner is not always able to buy exactly “proprietary” lubricant. Experts recommend Shell Helix Ultra, based on Pureplus technology, which enhances the basic properties of the lubricant.

Gasoline trimmers from the German manufacturer STIHL require STIHL HP Ultra, STIHL HP, STIHL HP S oils. A budget substitute may be the products of the company Vityaz, which by its properties is most similar to the recommended material.

Gasoline to oil ratio for lawnmowers

lawn mowers are a fairly common technique for weed control in country houses, homesteads, roads, and utilities. These devices have two other names. the grass trimmer and the lawn mower. The difference between these units is in their engines. The more expensive ones have four-stroke engines, all others have two-stroke engines. Of course, the latter are the most popular among the population, because they are simpler in design, lighter in weight and much cheaper than their four-stroke competitors. However, two-stroke models are inconvenient because the fuel mixture for them must be prepared manually, maintaining a strict dosage between gasoline and oil. In four-stroke counterparts, the mixing of these components is automatic, you only need to fill the gas tank and oil tank with the appropriate substances. Let’s talk about how to properly fuel a two-stroke brushcutter, because it affects how effectively and for how long will work such a machine.

Standard ratios

It is not unusual to have problems with the proportions of oil and fuel for the reliable operation of your brushcutter. The reason for this is the totally different information in the sources. You can face a difference in data on the ratio by ten units, and sometimes by half. That makes you wonder how much oil you really need per liter of gasoline: 20 ml or 40 ml. But for this purpose there is a technical passport for the product, which you buy in a store. You need a description of the machine, its operating manual and information about how to prepare the fuel mixture.

The first thing to consider is the information recommended by the machine manufacturer, because if your brushcutter breaks down, you can make a claim against it and not against a third-party source. If there is no instruction in the passport, and even more so if the passport is missing, it is recommended to look for another model of grass trimmer from a more reliable seller.

For all other cases when you have a lawnmower model in your hands and there is no way to know its technical features, there are standard proportions of the most likely components of the fuel mixture for a two-stroke engine. In general, these units use AI-92 gasoline and special synthetic oil, which contains a solvent for better mixing with fuel. Such oil evaporates slowly and has the ability to burn completely in the cylinder, leaving no carbon residue.

The standard ratio of synthetic oil to gasoline is 1:50. This means that you need 100 ml of oil for 5 litres of petrol, and accordingly the consumption of oil for 1 litre of petrol is 20 ml. Knowing the amount of oil needed to dilute 1 liter of fuel, you can easily calculate any rates in the preparation of fuel for grass trimmer. When using mineral oils, a 1: 40 ratio is most often standard. You would therefore need 25 ml for 1 litre of gasoline and 125 ml for a 5-litre jerry can.

When operating a lawn mower, a person with little experience in operating such equipment, will not have difficulty in determining and adjusting the actual amount of oil needed for a particular model. You just have to pay attention to the exhaust gases (their color and odor toxicity), cycle stability, engine heating and power output. details on the consequences of the wrong proportions of petrol and oil mixing you can expect in another section of the article. There are versions of brushcutters that run on gasoline AI-95. This also has to be taken into account.

If the manufacturer recommends a fuel with this octane rating, it is necessary to follow the requirements in order not to reduce the service life of the equipment.

Recommendations for storing the ready-to-use fuel mixture for the grass trimmer

After filling up the grass trimmer, many people save the remaining mixture in the bottle until the next time. Sometimes this next time does not come soon, and stretches until the next year. Do not keep the mixture ready for so long, since the oil will decompose. After you mix the fuel, use up the fuel mixture within 1-2 weeks. In addition, you should also not store the tool for a long time with the fuel mixture poured into the tank, as the effect will be similar. To prevent unforeseen circumstances, it is advisable to consider the following recommendations for storing a ready-to-use gasoline-oil mixture:

  • Only use as much of the fuel mixture as you plan to use. If you do not know how much fuel you will use, it is better to prepare less
  • If the fuel mixture remains in the tank of the grass trimmer (when the tool is hidden until the next season), then it must be completely used up or drained
  • Before adding the fuel mixture to the tank, stir it thoroughly
  • Store the finished mixture in a tightly screwed container, and in a place limited to sunlight

If all recommendations are followed, the service life of the grass trimmer will be at least as long as specified in the manual. The use of quality consumables paired with adherence to the recommendations on the preparation of the mixture in the grass trimmer, will entail a long and effective service of the gasoline tool.

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