The appearance of a characteristic knocking sound of hydraulic compensators on a cold engine or the lighting of the oil pressure lamp during long periods of inactivity often signals the accumulation of varnish deposits in the lubrication channels. In such situations, car owners often consider Liqui Moly Oil-Schlamm-Spülung as a means to restore circulation without expensive engine disassembly. The use of this additive involves operating the vehicle on contaminated oil for 150–200 kilometers before a scheduled replacement.
The action of the drug is aimed at gently dissolving sludge and carbon deposits, which inevitably form during fuel combustion and oxidation of the base oil. Long-term flushing differs from five-minute analogues in a more gentle, but extended effect on the internal surfaces of the engine. This allows you to avoid sudden peeling of large pieces of dirt that can clog the oil receiver mesh.
The main risk of ignoring the symptoms of contamination is the possibility of oil starvation of critical components such as camshafts or turbochargers. Application of specialty chemistry Liqui Moly allows you to minimize the likelihood of a major overhaul if the process is not too far advanced. However, the effectiveness of the procedure directly depends on compliance with dosages and operating temperature conditions.
Operating principle and chemical composition of the flush
The formula of the drug is based on a powerful package of detergent additives capable of dissolving oxidation and combustion products. Unlike aggressive solvents, Oil-Schlamm-Spülung works gradually, softening hard deposits and bringing them into suspension. This allows you to keep dirt in the oil volume until draining, preventing it from settling back in narrow channels.
The key component is a special base that is compatible with all types of motor oils, including synthetics and semi-synthetics. Chemical stability composition ensures that the additive will not conflict with the anti-wear additives of the base oil in a short period of use. This is critical to maintaining a protective film on the CPG parts during washing.
- 🧪 Dissolves hard varnish deposits and sludge in oil channels.
- 🛡️ Protects oil seals and seals from drying out and corrosion.
- 🔄 Restores the mobility of hydraulic compensators and phase regulators.
⚠️ Attention: It is not recommended to use flushing on engines with very high mileage without preliminary diagnostics, since softening a thick layer of carbon deposits can lead to clogging of the oil receiver.
Secret ingredient
Liqui Moly's formulation includes molybdenum disulfide in some versions or special surfactants that only work at certain temperatures, providing deep cleaning without damaging rubber seals.
When is flushing really necessary?
The use of flushing oil is justified when switching from mineral oil to synthetic oil or when purchasing a car with an unknown service history. If you notice that the new oil quickly darkens or has a burning smell, this is a sure sign of the need. cleaning the lubrication system. The drug is also effective when noise appears in the timing mechanism.
Frequent city driving with short trips contributes to the formation of condensation and sludge, making preventive flushing a smart step. Liqui Moly in such cases, it helps to remove emulsion and wear products accumulated over the winter. Regular use of high-quality oils reduces the need for aggressive chemicals, but does not completely eliminate it.
It is important to distinguish the need for flushing from mechanical failures. If the oil pressure has dropped due to wear on the crankshaft bearings, no amount of chemicals will help. However, if the reason is contamination of the mesh or channels, then engine flushing will be a salvation. Diagnosis must precede any action.
Step-by-step instructions for using Liqui Moly
The procedure for using long-term flushing requires careful attention to mileage and time. First, you need to warm up the engine to operating temperature so that the oil becomes less viscous and mixes better with the additive. Then turn off the engine and pour a full bottle of product into the oil filler neck.
After adding the composition, you must continue to operate the vehicle as usual. The maximum mileage with the additive should not exceed 200 kilometers, and the minimum is 150 km to provide sufficient time for the chemical reaction. The recommended periods should not be exceeded, since saturation of the oil with decomposition products reduces its lubricating properties.
☑️ Checklist before pouring
After the specified mileage, it is necessary to drain the used oil along with the dissolved scar. It is necessary to replace the oil filter with a new one, since the old one may be saturated with dirt. For the best effect, some technicians recommend doing a short intermediate flush with cheap oil before adding the final synthetic.
Comparison with five-minute analogues
The main difference between long-term rinsing and “five-minute” rinsing is the concentration of active substances and exposure time. Aggressive quick flush compounds can damage seals with frequent use, while Liqui Moly Oil-Schlamm-Spülung acts more softly. This is especially important for engines with older type rubber seals.
Five-minute washes often work on the principle of surface tension, removing only the top layer of dirt. Long-term preparations manage to penetrate micropores and hard-to-reach places, such as oil supply channels to hydraulic compensators. Cleaning efficiency in the long term it is higher for long-acting formulations.
| Parameter | Long-term flushing | Five minute rinse |
|---|---|---|
| Opening hours | 150-200 km | 5-10 minutes at XX |
| Aggressiveness | Low/Medium | High |
| Risk to oil seals | Minimum | Medium |
| Cleaning depth | High | Superficial |
Expert advice: If the engine is very dirty, after draining the flushing oil with additive, you can add inexpensive mineral oil, spin the engine for 5 minutes and drain it. This will remove most of the dissolved dirt before the final pour.
Effect of flushing on engine condition and service life
Proper use of flushing compounds helps extend engine life by restoring normal oil pressure. Clean lubrication channels ensure timely removal of heat from rubbing pairs, which reduces the thermal load on the pistons and rings. Motor life directly depends on the cleanliness of the lubrication system.
However, there are risks associated with the quality of the drug itself and the condition of the engine. If a thick layer of coke has accumulated in the engine over the years, its sudden softening can lead to large fractions getting into the gaps. That's why Liqui Moly Recommends gentle operation during the flushing period.
Statistics show that regular use of high-quality oils reduces the need for flushing. But for older cars or cars with replacement intervals of more than 10,000 km, the use of an additive is an effective preventive measure. The main thing is not to turn this into a habit every time you replace it for no apparent reason.
⚠️ Attention: It is strictly forbidden to operate a car with added flushing for more than 200 kilometers. Oil saturated with wear products loses its protective properties and can cause scuffing.
Main conclusion: Long-term flushing is more effective and safer than “five minutes”, but requires strict adherence to the mileage limit (up to 200 km) before changing the oil.
Frequently asked questions and misconceptions of car owners
There are many myths surrounding the topic of engine flushing that require clarification. Many are afraid that flushing will inevitably lead to oil seal leaks, but modern formulas contain components that prevent this effect. Others believe that flushing is only needed when switching to another oil, ignoring the condition of the engine.
It is important to understand that flushing is not a panacea for mechanical wear. If the engine knocks due to worn out bearings, chemistry will not help. But if the knocking is caused by coking of the hydraulic compensators, then Liqui Moly can work wonders. Critical thinking and diagnosis are more important than blind faith in the “magic bottle”.
Is it possible to leave flushing in the engine for longer than 200 km?
No, it's dangerous. After 200 km, the oil loses its lubricating properties, and the concentration of aggressive substances and dissolved dirt becomes critical, which can lead to oil starvation and scuffing.
Do I need to change the filter after washing?
Definitely. The oil filter retains most of the dissolved sludge and solid particles. If you leave the old filter, all the dirt will immediately return to the system when starting up.
Is flushing suitable for diesel engines with particulate filters?
Yes, Liqui Moly Oil-Schlamm-Spülung compatible with catalysts and particulate filters, as it does not contain phosphorus and zinc compounds in quantities harmful to the environment, provided the dosage is observed.
What happens if you fill the wash with new oil?
This is pointless and harmful. Flushing is designed to work in dirty oil before draining. Adding it to fresh oil will ruin its properties and require immediate replacement.