Liqui Moly Molygen vs Liqui Moly Leichtlauf High Tech

The Liqui Moly Molygen is fully synthetic engine oil best suited for use in modern Asian and American gasoline engines. It is used in engines having multi-valve technology and turbocharging. Whether the turbocharged vehicle comes with an intercooler or without it, The Liqui Moly Molygen will prove to be beneficial.

In the modern small turbocharged engines where temperatures can reach very high levels, The Liqui Moly Molygen offers thermal and pressure stability by reducing the friction in the engine by fifteen percent. This is done by an advanced additive package present in the oil. This phenomenon helps increase engine life by 30 percent in modern turbocharged vehicles.

Leichtlauf high-tech is another full synthetic engine oil by Liqui Moly. It can be used in both gasoline and diesel engines with or without catalytic converters. Many companies, including BMW, Porsche, Renault, Volkswagen, etc., have approved this engine oil. 

It offers exceptional engine cleanliness, which can help increase the vehicle’s fuel economy while helping catalytic converters reduce pollutant emissions.

Liqui Moly Molygen is a low viscosity engine oil. It uses an innovative additive technology, with Molybdenum being the main additive. The Molybdenum present can significantly reduce the friction in the engine. 

This prevention of frictional losses in the engine can increase the engine’s efficiency and lead to longer engine life. It also effectively cleans sludge build-up in the engine and provides maximum wear protection. All of these factors result in fuel savings and extended engine life.

Liqui Moly Leichtlauf is high-tech engine oil that offers great lubrication at high and low temperatures while also offering rapid oil delivery at low temperatures. 

It has excellent dirt cleaning properties and offers aging stability. It can be mixed with other compatible engine oils. It can provide high shear stability and smooth engine running even in extreme temperatures. It is known to provide long oil change intervals, even up to 40000 kilometers.

Liqui Moly Molygen vs Leichtlauf

Liqui Moly molygen new generation
Liqui Moly Molygen
Liqui Moly Leichtlauf High Tech
Liqui Moly Leichtlauf High Tech
SpecsLiqui Moly MolygenLiqui Moly Leichtlauf
Oil Type  Full Synthetic    Full Synthetic
Engine Type  Gasoline/Diesel    Gasoline/Diesel
Viscosity Grade SAE 5W-20, 5W-30, 5W-40, 10W-30, 10W-40 and 5W-50 SAE 5W-30, 5W-40, 10W-40
Price45$ for 5 liters45$ for 5 liters
  Oil Change Frequency  Up to 15000 kilometers (9000 miles)  Up to 40000 kilometers (25000 miles)
Additives UsedAnti-wear additives, Molybdenum additive, Dispersant additives, DetergentsAnti-wear additives, Dispersants, Detergents.  

Oil Type comparison

The Liqui Moly Molygen is fully synthetic engine oil. It uses an advanced MFC (Molecular Friction Control) technology that prevents frictional losses in the engine while also cleaning any deposit formation. This unique technology results in protection from wear and a flawless running engine.

The Liqui Moly Leichtlauf high-tech is also a fully synthetic engine oil in nature. It comprises an innovative base oil manufactured by synthesis technology with advanced additives present in it. It ensures fast lubrication of the engine in extreme temperatures, resulting in reducing oil and fuel consumption.

Comparing Additives

The Liqui Moly Molygen uses an additive package comprising of Molybdenum and tungsten. This special Molybdenum additive considerably reduces the friction between the pistons of the engine. 

It also has anti-wear additives present for optimum protection against engine wear. Dispersant and detergent additives don’t allow the build-up of sludge in the engine.

The Liqui Moly Leichtlauf high-tech has modern detergent and dispersant additives that clean the engine from deposits and prevent black sludge formation in the engine. 

Its anti-wear additive makes sure that the shaft and valve seals are flexible by providing excellent lubrication and helps in sealing any pinholes in the engine’s seals.

Effect On Engine Performance

Engine Wear-Off Protection

The Liqui Moly Molygen uses a combination of Zinc and Phosphorous called zinc dialkyl dithiophosphate (ZDDP) as an anti-wear additive. It has 861 Zinc and 781 Phosphorus ppm (parts per million). It forms a thin protective layer between the engine’s metal parts to stop them from rubbing off against each other. 

It also has high amounts of Molybdenum which helps reduce friction among engine parts. The lesser the friction is, the less the engine will wear off.

The same company manufactures both engine oils. The Liqui Moly Leichtlauf also uses ZDDP as an anti-wear additive. It offers rapid oil delivery at cold starts hence coating and protecting the engine’s components at low temperatures. At high temperatures, it offers high lubrication reliability to protect the engine.

Engine Seals Protection

The Liqui Moly Molygen can easily identify any broken seals in your engine. It comes in green color to serve the purpose of identifying leaks in your engine. It also comes with a UV light which you can use to scan for engine leaks. 

If you have an engine with suspected broken seals, you can fill it up with the Liqui Moly Molygen, and for the first 1000 miles, its color stays green. You can use the UV light to scan your engine and find the points with broken seals as the green color will shine brightly under the UV light. You can then fix these broken seals before they turn into anything worse.

The Liqui Moly Leichtlauf does not come in a bright color, so it is not very easy to identify engine leak points. However, its lubrication properties can seal worn-out engine seals. Its formulation also has a beneficial effect on the leak-tightness of the engine.

The Liqui Moly Molygen is better for identifying broken seals in engines, while the Liqui Moly Leichtlauf high-tech is a better option for sealing up the holes.

Reduction Of Sludge Build Up

Liqui Moly Molygen effectively cleans any sludge build-up in the engine using high amounts of calcium and a small amount of magnesium mixed as a detergent additive. The calcium and magnesium mixture suspends the deposits within the oil to be carried to the filter and removed.

The Liqui Moly Leichtlauf high-tech uses only calcium in a significant amount for engine cleaning. It is great at cleaning black sludge in the engine oil, which is caused by oil gelling at high temperatures.

Oil Change Frequency

Liqui Moly Molygen provides an oil change interval up to 15000 kilometers (9000 miles). On the other hand, The Liqui Moly Leichtlauf offers an oil change interval up to 40000 kilometers (25000 miles).

The Liqui Moly Leichtlauf is the better oil in terms of offering long intervals between oil changes.

Fuel Economy

Liqui Moly Molygen provides solid protection against the formation of deposits and keeps the engine clean. A clean engine means an increased fuel economy due to the increased efficiency of the engine.

The Liqui Moly Leichtlauf also provides extraordinary fuel economy due to its sludge cleaning abilities. The proper lubrication at cold and hot temperatures also helps make the engine work more efficiently and save fuel.

Oil Burn-off Protection

The Liqui Moly Molygen offers decent oil burn-off protection by acting against the loss of viscosity in the engine oil using its Molybdenum additive.

Liqui Moly Leichtlauf does not allow oil burn-offs at low and high temperatures by maintaining the lubrication within the pistons.

Both engine oils can provide good protection against oil burn-offs even under severe conditions.

Effect on Catalytic Converter

The Liqui Moly Molygen can be used in vehicles with catalytic converters. However, the high amount of phosphorous present can lead to the formation of phosphate deposits on the surface of the catalytic converter and reduce its conversion efficiency.

Liqui Moly Leichtlauf does no harm to catalytic converters. It has been tested with catalytic converters, and it does not allow any deposits to settle on the converter’s surface. Instead, it helps the catalytic converter reduce pollutant emissions.

Viscosity Comparison


The Liqui Moly Molygen comes in four viscosity grades: SAE 5W-20, 5W-30, 5W-40, 10W-30, 10W-40 and 5W-50. Using your vehicle’s owner manual, you can choose the best-suited viscosity grade according to your environment and engine.


The Liqui Moly Leichtlauf high-tech comes in only two viscosity grades: SAE 5W-30, 5W-40 and 10W-40. It is very limited in offering different viscosity grades, so if these two viscosities don’t suit your requirements, you can skip on the Liqui Moly Leichtlauf high-tech.

Cost Comparison

The cost of both Liqui Moly Molygen and Liqui Moly Leichtlauf is almost the same. Both of them cost only around forty-five dollars (45$) for a 5-liter bottle, making them a very cost-effective option.


The Liqui Moly Molygen offers good wear protection, fuel economy, and longer engine life. It helps in finding broken engine seals due to its easy-to-spot vibrant green color and the UV light that comes with the package.

The Liqui Moly Leichtlauf provides very long oil change intervals and its remarkable lubrication properties. It can help seal any broken engine seals and offer extended engine protection.

The Liqui Moly Molygen is the better pick if your vehicle is relatively new with little mileage and a modern turbocharged engine. It will protect the compact engine and help identify any broken seals as soon as possible, so they don’t turn into something worse.

On the other hand, if your vehicle has at least 100 kilometers of mileage, the Liqui Moly Leichtlauf will prove to be the better engine oil as it will help restore any broken seals and overall efficiency of the engine.