The compressor is the “heart” of the refrigerator, and its uninterrupted operation directly depends on the quality and type of oil. But what to do if the original oil has run out and is not available in stores? Or if the refrigerator is an old model, and the manufacturer no longer produces “original” lubricant? In such cases, many owners think about replacing the oil with an analogue one. However, not every oil is suitable: the wrong choice can lead to compressor overheating, freon leakage or even unit breakdown.
In this article we will look at what types of oils compatible with household refrigerators, what is the difference between mineral, synthetic and semi-synthetic compositions, and how to choose a replacement without risk to the equipment. You will also learn what mistakes are most often made when changing oil, and why even correctly selected oil can cause harm if you do not take into account the type of refrigerant in the system..
Why you can’t fill in the first oil you come across
The refrigerator compressor operates under extreme conditions: high pressure, constant temperature changes and contact with refrigerant (freon). Conventional motor or industrial oils are not designed to withstand such loads. They can:
- 🔥 Decompose under the influence of freon, forming acids that corrode seals and metal parts.
- ❄️ Thicken in the cold, making it difficult to start the compressor in a cold room.
- 💨 Foam, which leads to hydraulic shocks and premature wear.
- 🚫 Do not mix with the refrigerant, disrupting heat transfer and reducing cooling efficiency.
In addition, modern refrigerators use different types of freon (for example R134a, R600a, R12), and each requires oil with certain properties. For example, R600a (isobutane) is compatible only with with synthetic polyolester oils (POE), and for R12 mineral oil was suitable. If mixed up, the compressor can fail in a few days.
⚠️ Attention: If you do not know what refrigerant is used in your refrigerator, don’t take risks change the oil. The type of freon is usually indicated on the compressor nameplate or in the technical data sheet. For models older than 20 years, information can be clarified by brand and year of manufacture.
Types of oils for refrigerator compressors
All oils for refrigeration compressors are divided into three main groups. Their properties and scope of application are very different:
| Oil type | Compatible refrigerants | Advantages | Disadvantages |
|---|---|---|---|
| Mineral | R12, R22, R502 | Low price, stability at high temperatures | Incompatible with modern freons, oxidizes quickly |
| Semi-synthetic | R134a, R404A | Better fluidity at low temperatures, reasonable price | Shorter service life compared to synthetics |
| Synthetic (POE, PAG, AB) | R134a, R600a, R410A | Long service life, compatibility with environmentally friendly freons | High cost, hygroscopic (absorbs moisture) |
For refrigerators manufactured after 2010, most often used synthetic POE oil (polyolester). It is compatible with most modern refrigerants, including R134a i R600a. However, POE has a serious disadvantage: it actively absorbs moisture from the air, so when changing the oil, you must thoroughly dry the system.
How can you replace the original oil: safe analogues
If the original oil is not available, you can select a replacement according to two criteria: refrigerant type and recommendations of the compressor manufacturer. Below are proven options for different cases.
1. For refrigerators with freon R134a or R600a
These refrigerants require synthetic oil POE. Suitable analogues:
- 🛢️ Emkarate RL (ICI) - universal POE oil for household refrigerators.
- 🛢️ Bitzer BSE - high-quality synthetics, compatible with R134a i R600a.
- 🛢️ Mobil EAL Arctic — an environmentally friendly option for modern models.
2. For old refrigerators with freon R12 or R22
Alkylbenzene (AB) mineral oil or alkylbenzene (AB):
- 🛢️ Suniso 3GS - classic mineral oil for R12.
- 🛢️ Reflube AB - alkylbenzene oil for systems with R22.
⚠️ Attention: If you replace R12 with R134a (which is sometimes done when retrofitting old refrigerators), be sure to flush the system and replace the oil with POE. Mixing mineral and synthetic oils leads to the formation of sediment!☑️ What to check before changing the oil
Done: 0 / 4Step-by-step instructions for changing the oil
If you decide to change the oil yourself, follow this algorithm. Errors at any stage can lead to breakdown of the compressor!
- Disconnect the refrigerator and let it stand for 12-24 hours so that the freon condenses in the condenser.
- Drain the old oil:
- Turn the compressor over (if it is removable) or use a syringe with a tube to pump the oil through the service port.
- Heat the compressor with a hairdryer to 40–50°C so that the oil becomes less viscous.
- Rinse the system (if you change the oil type):
- Fill in flushing oil (for example, Flush Oil) and pump the compressor idle for 10-15 minutes.
- Drain the flush and purge the system with nitrogen.
- Fill in new oil:
- The volume of oil is indicated on the compressor nameplate (usually 200–500 ml).
- Use a funnel with a filter (mesh size no more than 50 µm).
Vacuum the system at least 30 minutes to remove moisture. Fill with freon and check for leaks. After changing the oil, turn on the refrigerator and monitor it for 2-3 days. Signs of problems:
- 🔊 Increased compressor noise.
- 🌡️ Poor cooling (the temperature in the chamber does not drop below +10°C).
- 💦 The appearance of oil stains under the refrigerator (leakage).
What not to do: common mistakes
Even experienced technicians sometimes make critical mistakes when changing oil. This is what is strictly prohibited:
- Mix different types of oils (for example, mineral and synthetic). This leads to the formation of flakes that clog the capillary tube.
- Use automotive or industrial oils. They are not designed to work with freon and can foam.
- Fill in oil “by eye”. A lack of oil leads to overheating, an excess leads to water hammer.
- Ignore vacuuming. Humidity in the system causes corrosion and oil decomposition.
- Work without protective gloves. Some oils (for example, POE) irritate the skin.
⚠️ Attention: If you changed the oil, but the refrigerator began to work worse, do not try to “add” another oil. Most likely, the problem is incompatibility with the refrigerant or residual old oil. In this case, a complete flushing of the system is required.What happens if you fill in the wrong oil?
Incompatible oil can react with freon, forming acids and sediment. This will lead to:
- jamming of the compressor (repair will cost 70-80% of the cost of a new refrigerator),
- leakage of freon through corroded seals,
- reduction in cooling efficiency by 30-50%.
Where to buy oil for a compressor and how not to run into a fake
It is better to purchase oil for a refrigerator in specialized stores or from official distributors. Beware of fakes —they are often sold in markets or in dubious online stores under the guise of “universal oil for refrigerators.”
Signs of the original oil:
- 🏷️ The label indicates type of refrigerantwith which it is compatible.
- 📦 The packaging is sealed, with a protective membrane under the lid.
- 🔍 There is no sediment at the bottom of the canister (check for light).
- 📄 There is a certificate of conformity (can be requested from the seller).
Prices for original oils (for 2026):
- Emkarate RL 32 (1 liter) - from 1,200 to 1,800 ₽.
- Bitzer BSE 32 (1 liter) - from 1,500 to 2,200 ₽.
- Suniso 3GS (1 liter) - from 800 to 1 200 ₽.
If there are no specialized stores in your city, order oil through trusted online platforms (for example, All-Climate, Holod-Service). Do not buy oil at marketplaces without reviews - the risk of running into counterfeit products is too high.
When it is better to entrust an oil change to a professional
Some situations require specialist intervention Contact the service center if:
- 🔧 The refrigerator is under warranty (self-repair will void the warranty).
- 💥 The compressor has already worked intermittently (knocked, got hot, turned off).
- 🔄 You are not only changing the oil, but also refrigerant (for example, from R12 on R134a).
- ⚡ There was a freon leak in the system (diagnostics for leaks is required).
The cost of changing the oil in the service:
- Without flushing the system - from 2 500 to 4,000 ₽.
- With washing and vacuuming - from 4,500 to 7,000 ₽.
- With replacement of freon - from 6,000 to 10,000 ₽.
If you doubt your abilities, it is better to overpay for the work of a specialist than to risk the compressor. Repairing or replacing a compressor will cost 10-15 times more expensivethan a professional oil change.
FAQ: Frequently asked questions about changing the oil in a compressor
Can I use 5W-30 motor oil instead of specialized one?
No! Motor oils contain additives that react with freon. This will lead to the formation of acids and breakdown of the compressor within 1-2 months.
How much oil should be poured into the compressor?
The volume is indicated on the compressor nameplate (usually 200–500 ml). If the nameplate is worn off, refer to the model:
- Danfoss — 250–350 ml,
- Embraco — 200–300 ml,
- Secop — 300–400 ml.
Overfilling is just as dangerous as underfilling!
What to do if after changing the oil the refrigerator does not cool?
Probable reasons:
- There is air left in the system (evacuation must be repeated).
- The oil is incompatible with freon (flushing and replacement is required).
- The capillary tube is clogged (needs cleaning or replacement).
Do not try to “top up” the freon yourself - contact service.
Is it possible mix oils of the same type, but from different brands?
Theoretically, yes, if both oils of the same type. (for example, POE) are intended for the same refrigerant. But it is better to avoid mixing - different manufacturers use different additive packages that may conflict.
How often do you need to change the oil in the compressor?
In household refrigerators, the oil is designed for its entire service life (10–15 years). Replacement is required only in the following cases:
- Repair of the compressor.
- Freon leaks with partial loss. oil.
- Switching to another type of refrigerant.
Preventive replacement not needed and can cause harm!