What oil to put in your lawnmower?

What gasoline and oil to fill a lawn mower

Self-propelled gasoline lawn mower. it is a complex technique, which can mow the grass, as well as perform other functions. Due to the fact that it is equipped with an engine, it can be used by physically weak people. This technique should be taken care of regularly. One of the necessary procedures is to change the oil. Everyone who has such a device should know what kind of gasoline to pour into the lawnmower. It is necessary to know how to choose the right fuel for your model, it can be AL-KO (AL-KO), DAEWOO, Honda (Honda), Husqvarna (Husqvarna), Patriot (Patriot), Stiga, Champion, etc.д.

4-stroke engines, unlike 2-stroke engines, have a more complex design. Four-stroke mowers are more powerful and therefore more efficient. These engines are more economical. They are cleaner, because they provide good control of the air inlet and outlet cycles.

Because the fuel goes out during feed and compression, some of it is wasted in the two-stroke cycle. This does not happen in the other engine, there is a pulling of gasoline into the closed system. 2-stroke engines are filled with petrol and gas mixtures. which reduces combustion efficiency, increases emissions in the form of burnt harmful oil. They mix fuel and oil, it negatively affects the service life. because of the general circulation, these lawnmowers can be operated in all conditions.

A 4-stroke engine has a specialized lubrication system. It injects engine oil from a separate container. Oil is separate from the fuel. so the motor is better lubricated. Automotive engines run primarily on a four-stroke cycle.

The simple design and fewer moving parts in a 2-stroke brushcutter makes maintenance and repair easier. They are much lighter.

Cleaner operation of four-stroke engines and a special lubrication system result in less wear and tear and longer life of such parts.

In two-stroke engines, because there is a dirty combustion product after the fuel and oil are burned, there is more wear and tear on the engine system. The result is that it breaks down more quickly. Lawn mowers with this engine cost less, but cost per hour of work is higher due to the extra cost of oil and the low fuel economy.

Features of two and four stroke engines

Two-stroke engine is similar to a four-stroke engine in its operating principle. The only difference is that the stroke of a two-stroke engine takes 2 strokes and a four-stroke engine takes 4 strokes. The latter refers to downward or upward movement of the piston. During 1 revolution of the crankshaft two strokes occur. The stroke of the piston is its motion, during which the energy of the gases from the combustion of fuel is converted into useful work (rotation) of the engine.

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Structurally and operationally, the two-stroke and four-stroke models of internal combustion engines differ from each other according to the following criteria.

  • Two-stroke engines have higher power-to-weight ratio and liter capacity (approximately 1.5-1.8 times higher).
  • Lubrication method.
  • The four-stroke engines are characterized by high fuel economy (fuel consumption is about 20÷30% less) and emission of less toxic substances
  • The way in which the fuel mixed with atmospheric air is fed into the cylinder and the exhaust gases are removed. 4-stroke engines have a valve timing mechanism for that purpose: it opens and closes the valves when you need it. The 2-stroke models have no such service life.
  • Operating noise level: 4-stroke units are quieter.
  • The complexity of the machine: 2-stroke models are simpler.
  • 4-stroke motors have a longer service life due to their improved lubrication system and the fact that the crankshaft rotates at a slower speed.
  • Rapid maximum RPM: 2-strokes accelerate faster.
  • The 2-stroke engine is easier to deal with for ease of periodic maintenance and repair. Also this motor is less expensive and weighs less than its four-stroke counterpart.

The power density is the ratio between the drive unit power and its weight. The liter capacity is the ratio between the output and the engine displacement (in liters).

Absence of a valve timing unit makes two-stroke engines lighter and simpler in terms of design. The cylinder is filled with fuel-air mixture and purged of gas by expansion and compression through special holes: the inlet (blow-off) and outlet.

Special features of lawnmowers

Despite the fact that the general design of four-stroke engines for lawnmowers is similar to automobile, they still have important differences: in order to reduce the price of the product at lawnmowers excluded oil pump and generally the system of oil supply, it increases the requirements to the viscosity used in the motors of garden equipment. Engine oil in lawnmower engine is distributed by the crankshaft: it is scooped up from the crankcase and sprayed on the parts. Due to this design, the viscosity of the lubricant must be sufficient to retain the oil film on the parts, while at the same time it must not be too thick so as to hinder the movement of parts or form a hard crust.

on the other hand, lawnmowers operate mostly at positive ambient temperatures and the load on their engines is not as severe as on car engines. Lawnmowers most often do not require a “cold start” in the cold, which greatly reduces the life of a car engine and requires low-temperature properties from the lubricant.

Even vice versa, lawnmowers, as a rule, are air-cooled and that’s why their engine temperature is higher than that of liquid-cooled car engines.

The first filling is designed for running in of the engine. after five hours of work it is replaced, and then the new grease can be used for the whole season. In the future, replace it according to the regulations after a certain number of hours, or drain it at the end of the cottage season and the next year pour a new.

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Choice of oil manufacturer

Shell Helix Ultra has been on the market for a long time. This is a synthetic oil made from natural gas. Contains a large number of additives that help the trimmer wear out much less.

Lawnmower Oil Change

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Rasenmaher makes quite good mineral greases especially designed for garden tools.

Liqui Moly makes quality oils with additives that are environmentally friendly.

Oils are to be differentiated according to their viscosity.For ambient temperatures from.10°C to 35°C SAE 15W40 or 15W30 is suitable. For colder weather it is better to use SAE 5W20, SAE 5W30, SAE 10W30.

What kind of oil to put in your lawnmower?

Everyone knows that a car engine requires special care to ensure a long and trouble-free life for the engine. The same goes for the gasoline lawnmower engine: whether it’s a weed trimmer or a large four-wheel mower, you’ll have a problem choosing the right oil. So what are the essential requirements for lawnmower engine oil??

As with any machine, the lawnmower has a manual, which prescribes not only the main characteristics of the tool, but also the rules of care for it. So, in the instructions will be written that for lawnmowers you need to use only specialized oil. And some manufacturers even insist on using the same brand of oil as the lawnmower itself.

In fact, this fact turns out to be just a marketing ploy by manufacturers, and both car and motorcycle engine oil for four-stroke engines can be suitable for lawnmower. It’s enough just to follow the basic rules:

Oil must be mineral or semi-synthetic. Fully synthetic oil can burn the engine, so it is better not to use it at all. When working on a lawnmower, mineral oil produces a lot of sludge, so we advise you to opt for semi-synthetic oil. Also mineral oil is hard to find these days.

The oil viscosity should not exceed SAE 30 or 10w30, and the quality category should range between SE and SJ. Viscosity oil can impair engine operation, even less viscous oil. All of these qualities must be mentioned on the packaging.

Select oil depending on operating temperature conditions. If you mow in cold weather, the oil viscosity can be higher than the above, but you will have to change to the right oil the next time you turn on.

In four-stroke mowers, oil is filled into the special crankcase and never mixed with petrol, as this lawnmower is not designed for mixing oil and fuel. On the contrary, it may cause engine damage. It’s enough to change oil at least once a season, since the crankcase normally holds 450 to 600 ml of oil. enough to cover a large area. But don’t be lazy to check the oil level before each use.

How oil is used in lawn mowers with two-stroke engines?

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As a rule, a two-stroke engine is installed on trimmers for grass, and since their design does not imply the presence of extra parts, a separate container for the oil is not provided. What to do in this case? To prepare the fuel mix.The same rules work for lawnmowers with two-stroke engines as for their larger counterparts, with one exception. you need to buy oil for units with a two-stroke engine.

On every trimmer (or in its user manual) you can see the proportions of mixing fuel and oil: from 1:32 to 1:35. This rule is only valid for mineral oil! Since it is now difficult to find, and the cost can discourage, most often semisynthetic or even synthetic oil is used. Note that the mixing proportions in this case change, and become 1:50. If in doubt, look carefully at the oil’s packaging, which usually has this information on it. These are the ones to look out for. To prepare the mixture, simply pour 100 ml of oil into five liters of gasoline, which should be enough for a whole season of regular mowing. If not. repeat the procedure.

What kind of grinders are available??

Before proceeding to the selection and preparation of fuel and lubricant materials, you should understand what kind of grease, and already on the basis of this knowledge to make an informed purchase. Depending on the type of motor installed, use the appropriate group. They are marked with 2T and 4T.

Depending on the base used, they are distinguished:

  • Mineral. Budget group. It is based on petroleum products. They are characterized by higher viscosity. Designed for small engines. Must be replaced often. The product is well suited for the temperature range of 10 to 250 C. Gels quickly under the influence of low temperatures. Many additives are added to increase the performance and stability of the oil, but they will burn out over time. Main disadvantage. low service life.
  • Synthetic. Produced by synthesis. As a raw material, substances containing esters are used. Lubricating qualities are an order of magnitude higher than those of mineral oils. Identical size of all molecules reduces friction. Low viscosity can be compensated by long service life and immutability at high temperatures. Best solution for sophisticated equipment that is in use all year round. Cost leaves a lot to be desired.
  • Semi-synthetic. A golden mean between the two above-mentioned types. Produced by distillation of petroleum products and hydrocarbons. Component ratios vary by manufacturer. It has a medium smokiness rating and reliably protects the components.

It is strictly forbidden to mix oils with different structures. Since they have different properties from each other.

Ignoring this rule can lead to breakdowns and costly repairs of garden equipment. Before you start using a substance of another type, it is recommended to thoroughly wash the container and only after that pour the new grease. Most manufacturers add to their products dyes that are characteristic for a particular category of fluid (red, blue, green). This will reduce the chance of making a mistake.

Types of additives

In order to increase the performance characteristics of the fuel and lubricant, different kinds of substances are added to it. Depending on their quantity and type, similar substances may differ in their properties.

  • Wear-resistant. Reduces cushioning of parts when the machine is in operation.
  • Antioxidant. Prevent the formation and passage of oxidation processes. It increases the life span.
  • Anticorrosive. Protect surfaces of parts and assemblies against rusting.
  • Antifriction. Designed to reduce the negative effects of friction.
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API classification

American standard used worldwide. It helps to choose a product with similar properties, best suited for a certain application.

  • TA. For air-cooled engines up to 50 cc and air-cooled. These include grass trimmers, lawn mowers, mopeds, scooters, and more.
  • TB. Combined with engines from 50 cm3 to 200 cm3. Class compatible with trimmers.
  • TC. For machines with higher quality requirements. For motorcycles, snowmobiles, chain saws and other land vehicles.
  • TD. For liquid-cooled engines (boats, jet skis, speedboats, etc.).

JASO classification

Japanese standard that describes smoke emission during operation. Usually marked with a second letter designation.

  • FA. Minimum smoke emission. Important for countries where this process is subject to strict requirements.
  • FB. For countries where smoke emission is regulated by stricter laws. Hardly any discharge.
  • FC. Clear smoke, invisible to the human eye.
  • FD. Group for two-stroke engines. Owing to their high physical and chemical properties, practically no smoke is emitted. Mainly used for the preparation of fuel and lubricants for the subsequent filling of boats, boats and yachts.

In addition to the classification described above, it is also possible to meet the Selfmix and Premix designations. The latter means a lubricant that needs to be shaken before mixing, the former does not need such manipulations.

The role of oil in the lawnmower engine

Gasoline lawnmowers can be equipped with either four-stroke or two-stroke engines. The cutting elements rotate/move by means of the energy input from the engine. Energy is produced by the expansion of gases created during the explosion of gasoline or fuel mixture in the combustion chamber. The very same compression of the gases created is provided by the movement of the piston. In general, the simple principle of an internal combustion engine.

In order for such a system to function properly as a whole, there must not be too large gaps between its mating elements. If the gap dimensions are increased due to wear and tear, it will lead to a deterioration of the entire engine, and over time to the simple impossibility of starting it. The problem will be that the system will not be able to achieve the required pressure to burn the fuel mixture mixed with atmospheric air.

The purpose of engine oil is to put a thin film on the engine components to slow their wear, and also to prevent the formation of burrs on the metal surfaces of the mating parts. This is the main function of oil in the gasoline lawnmower engine. However, it is worth understanding that oil does not completely stop the destruction of working nodes caused by friction between them, but only slows down this process significantly.

Lawn Mower Oil Guide: What Type of Lawn Mower Oil Should I Use? | eReplacementParts.com

In addition to reducing the friction coefficient between the mating working parts of the engine, the oil contributes to:

  • Providing better cooling of the drive unit during operation, while increasing the level of heat transfer processes between the atmospheric air and the metal;
  • the motor works at the maximum intensity level, which increases the efficiency of the activity and reduces the time expenditures;
  • To protect the drive unit metal against corrosion when the machine is not in use during the cold season.

The engine oil is thus a special material that is able to keep the engine and other systems in the mower running smoothly. If you neglect the quality of this material, the machine will be more susceptible to various breakdowns.

Design features of four-stroke and two-stroke engines

According to their operating principle, these engines have much in common. The only difference is that the two-stroke motor has two strokes, and the four-stroke motor has four strokes. Individual downward or upward movements of the piston are understood as one stroke. Two strokes per revolution of the crankshaft. The stroke of the piston is understood as its movement, during which the energy of gases is converted into useful engine work (its rotation), as a result of fuel combustion.

In terms of performance and design characteristics, two-stroke and four-stroke engine models differ from each other according to the following criteria:

  • The power density per liter is about 1.5 to 1.8 times higher for two-stroke engines.
  • They differ in the way they are lubricated.
  • The four-stroke motor is characterized by better fuel economy (20-30% less fuel consumption) and fewer exhaust emissions.
  • Different methods of feeding the fuel mixed with air into the cylinder and evacuating the exhaust gases. The four-stroke engines have for this purpose the gas distribution mechanism which at the necessary moment opens/closes special valves, and the two-stroke models have no mechanism. the “waste” simply flows out through the stationary holes.
  • The four-stroke models are quieter.
  • Two-stroke models have an easier overall design.
  • Improved lubrication system in four-stroke models significantly extends their service life. They also have a longer service life because the crankshaft rotates at a lower frequency.
  • The engine can be started up more quickly and more easily with a two-stroke cycle.
  • Periodic maintenance frequency will be easier for two-stroke models and can be done by yourself.
  • Four-stroke motors weigh more and cost more.

IMPORTANT! It is the absence of a valve timing mechanism that makes two-stroke motors simpler and easier to design. Filling the cylinder with air/fuel mixture as well as gas purging occurs by compression/expansion of the mixture and venting/injection of the mixture through special holes.

Lubrication methods in different types of engines

The use of oil in different types of engines to lubricate the internal parts is an essential point in the maintenance process and consists in the fact that two-stroke models are not filled with pure gasoline, but its mixture with motor oil in appropriate proportions. This mixture, when combined with air, wraps around in the piston assembly, while lubricating the walls of the cylinder, along with the bearings of the connecting rod and crankshaft, as well as the pistons themselves. During the combustion of the fuel mixture, the oil in its composition in tiny droplets also ignites. The combustion products are converted into exhaust gas and vented to the outside through openings.

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IMPORTANT! There are some two-stroke engines that feed the fuel mixture elements (oil and gasoline) separately, but this is not used in lawn mowers.

In a four-stroke combustion engine, the oil is fed separately, not mixed with petrol at all. The lubrication process is carried out by special pipelines, valves and filter as well as an oil pump. The filter is designed for cleaning oil from the smallest metal fragments, which are formed in the process of friction of metal units.

Hence it is clear that in two-cycle engines the oil will be burned during operation, but not in four-cycle engines, and it remains in the system for a long period of time. That is why the requirements for the performance of oil for different types of internal combustion engines and different. Such qualities include the fact that oil for two-stroke devices should leave as little fouling as possible, and for four-stroke devices it is necessary that the oil substance should retain its useful physical and chemical properties as long as possible.

Mixture requirements for two-stroke engines

The difference of a two-stroke engine is its increased power compared to a four-stroke. The combustible mixture for it is prepared in a certain ratio of gasoline and special oil. How much oil to petrol ratio for your lawnmower is optimal, you will find in the owner’s manual. The recommended proportions must be strictly adhered to. When adding additives the manufacturer has taken the engine type into account. For this reason, mixing different oils is not permitted.

Applying mineral oils, mixing is carried out in the proportion of 1:25, 1:30, 1:35. The ratio for synthetic oils is 1:50 or 1:80. This means that in each of the proposed mixtures, the right amount of oil is dissolved in the volume of gasoline. Mixing gasoline with lawnmower oil is like mixing water with syrup. It is necessary to pour petrol, add the exact amount of oil and shake the mixture. It is desirable to use a fresh solution for work. If stored for more than 2 weeks, the mixture will change and the oil film will cause the carburetor to malfunction.

Do not use PET bottles for diluting and storing the mixture. Gasoline destroys plastic, the polymer dissolves in the combustible mixture and further deteriorates the quality of the fuel, creating the risk of stray currents.

The fundamental differences of internal combustion systems for the user

Which combustion system is more efficient, the 2-stroke or the 4-stroke?? How to understand the user and buy the best machine? You can not find 4-stroke petrol trimmers and brushcutters on the market. The two-stroke is much lighter, so the grass trimmer weighs a little and can be handled by a woman. But there are also two-stroke engines on four-wheelers. Other differences:

  • different way to use lubrication;
  • The eco-friendliness of a four-stroke motor is higher, and it’s also less noisy;
  • easier to repair and maintain the 2-stroke engine;
  • 4-stroke has a longer service life but is more difficult to maintain due to oil changes in the lawnmower
  • 2-stroke engines are lighter and less expensive.

The 2-stroke engine used in a lawn mower is inferior in many technological respects to the 4-stroke engine. It is preferable for light equipment in terms of economy and other indicators with a separate petrol and oil supply. In addition, the separate fuel supply saves up to 4 times the consumption of an expensive component.

The photo shows the engine that was running without oil changes for a long time.

A 4-stroke engine has a complicated lubrication system and it is all the more necessary to use ways to clean the circulating fluid. The oil system has a filter that prevents scale and other inclusions from clogging up the tubes and pump. Replace this part as it becomes contaminated.

How to change the oil in a 4-stroke engine

The manufacturer gives a schedule of machine maintenance and the order of work in the owner’s manual. Lubrication efficiency decreases after 50 hours of operation. That’s why you need to change the oil. In daily use it is not enough to use the unit for a season, and filter cleaning, oil changing should be done at preservation. Before you change the oil in the lawnmower, you need to increase the fluidity of the fluid, start the engine and let the system warm up.

It is necessary to unscrew the plug to pour oil into the tank and use a device to take the fluid under vacuum.

To do this make the nozzle and pump out the used oil into a prepared container. But in this case small part, up to 100 ml will remain in the crankcase and drip from the filter. You should get rid of this residue by draining the liquid for about 5 minutes through the hole. At the same time in the system to change or flush the filter. After that, pour in new grease, checking the level with a dipstick. Usually motor oil is packaged in opaque black plastic so it does not decompose in the light. The required volume is 500-600 ml.

Changing the oil in a lawn mower. video

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I have had an American lawn mower for about 15 years. My engine is almost like new, I used only Liqui Moli oil after the factory one.

Thanks for the article! I own a 4-stroke lawnmower. Despite the high price, I buy Liqui Moly’s vegetable-based Rasenmaher-Oil 30 mineral oil for it. It does not change its viscosity during operation, it has good detergency properties and, due to the additive package contained in this oil, reduces engine wear.

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