Car engine washing before the MOT – myth or necessity?

There are many myths and misconceptions among drivers about washing the engine before the MOT. One of the biggest beliefs is that a dirty engine can cause additional problems during the test. It is also believed that technicians may have a negative perception of a dirty engine, which could lead them to tighten the inspection process. Another popular perception is that cleaning the engine may improve engine performance, but in reality, improper cleaning can cause more harm than good, for example by damaging electrical connections. Are these beliefs justified or are they just myths worth dispelling?

When is engine cleaning necessary?

Engine washing is not always necessary in preparation for a car inspection, but in some cases it can help. One of the main reasons to wash the engine before the MOT is fluid leaks. Technicians carefully check the engine for leaks of oil, coolant or other operating fluids, which can be a sign that the engine has failed. If the engine is covered with a thick layer of dust and oil, technicians may suspect that this is an attempt to hide signs of leaks.

A dirty engine can also cause additional problems during the inspection. If dirt or oil build-up prevents technicians from properly assessing certain components, it can be more difficult to diagnose the real condition of the car. In addition, residual oil, soot and other dirt can mislead the inspectors – for example, they may think that the engine is leaking oil, even though it is actually just old stains that have accumulated over time. In such cases, a clean engine makes it easier to spot real problems and avoid additional questions during the inspection.

It is therefore important to assess the condition of the engine before deciding whether it is worth washing it – if there are fluid leaks or large accumulations of dirt, washing can be a useful procedure.

Can engine washing be harmful?

Although this procedure helps to keep the engine clean and facilitates the maintenance process, it can also cause some problems, especially if not carried out correctly. Many modern cars have sophisticated electronic systems, sensors and electrical connections that are not resistant to moisture. Water entering these areas can lead to short circuits, error messages in the computer or even engine failure. It is particularly dangerous to wash the engine with a high-pressure jet of water, as it can over-wet the electrical components.

It is also important to take into account the detergents used. Strong chemicals used to dissolve grease and oil residues can damage plastic, rubber and even metal parts.

How do I safely wash my engine in Vilnius?

To avoid possible damage, it is recommended to wash your engine carefully and with the right equipment. Improper cleaning can lead to electrical faults, short circuits or even mechanical engine failure, so it is important to know where and how to safely carry out a car engine washing in Vilnius.

Where to go for professional engine washing in Vilnius?

There are many car washes and garages in Vilnius that offer these services, but they do not always use safe technologies and tools. When looking for an engine wash in Vilnius, it is best to go to a reliable car service or a specialised car wash that properly protects sensitive engine components during the wash. Before choosing a service, it is worthwhile to do your research, read reviews, consult with specialists and find out what technologies are used for washing.

Alternative methods: steam cleaning and green solutions

If you are worried about potential damage or are looking for an environmentally friendly solution, alternative methods are worth considering. One such method is the currently popular steam cleaning of the engine, which effectively dissolves dirt without risking the electronics. Eco-washing is another great alternative. Some companies offer biological cleaners that not only effectively remove oil and fuel residues but are also more environmentally friendly.

To wash or not to wash?

While some drivers believe that a clean engine can help them pass an inspection, others fear that washing can cause more problems than benefits. So when should you wash your engine before an MOT and what do the experts advise?

Washing is useful if the engine is heavily contaminated with oil, coolant or other fluid residues that may raise suspicions at the time of inspection. Also, if the car is used frequently or driven in difficult conditions, a lot of dirt and dust may accumulate, making it difficult to inspect its components. By the way, when planning to sell a car, experts also advise to wash the engine.

Thus, car care professionals recommend that you first visually assess the condition of the engine before the TA. If there is no significant build-up of dirt or signs of oil leaks, a wash is not necessary. On the other hand, if the engine is dirty, it is better to contact a professional who can carry out quality work. However, if you decide to wash the engine before the TA, it is advisable to do it a few days before the inspection to allow the engine to dry out completely.