Liqui Moly Cera Tec vs Motor Protect

Cera Tec and Motor Protect are both formulated by the Liqui Moly industries as anti-wear additives which are to be mixed with the motor oils to increase their wear reduction performance.

Cera Tec completes the task of wear reduction by using both the physical and chemical processes. Physically it uses microscopic ceramic particles and utilizes its friction modifiers chemically. This unique combination of both physical and chemical wear reduction methods makes it one of the best anti-wear additives.

Whereas Motor Protect protects the engine by reducing the friction which leads to lesser wear and tear, thus, protecting the engine. Unlike its counterpart, it only depends upon its highly advanced friction modifiers and anti-wear additives which reduce the friction, hence, wear inside the engine. It has no physical solvents available, making it ideal for consumers who are not comfortable with the solid additives inside their engine oil.

Comparatively, Motor Protect has more advanced anti-wear additives along with the friction modifiers, therefore, performs better than Cera Tec, even though it uses a combination of both ceramics and friction modifiers. It also provides higher fuel efficiency and a longer engine life but lacks behind its competitor in terms of the motor oil volume it can cater to.

Comparison Table

SpecificationsCera TecMotor Protect
ManufacturerLiqui MolyLiqui Moly
Made inGermanyGermany
Additive TypeAnti-wearAnti-wear
CompatibilityBoth petrol and diesel enginesBoth petrol and diesel engines
Mode of WorkingBoth physically and chemicallyOnly Chemically
Area of ApplicationCarsCars
ColorBeigeRed and Brown
FoamLiquid (suspension)Liquid (solution)
Cost (per liter)114.97$135.98$


Cera Tec is mainly used with the 4-stroke diesel and gasoline engines as well as manual transmission and compressors. It can be used with the engine fitted with turbochargers along with those which are not. Most importantly it can be mixed with any commercially available motor oil. It is suitable to be used with catalytic converters. The ceramic particles it contains are small enough (0.5µm) to easily pass through both the diesel and gasoline particulate filters without blocking the oil flow through them. It also works well with the newly innovated “belt-in oil” belt system which immerses the engine’s main drive belts in oil for quieter and smoother performance. However, it is not suitable with automatic transmissions and wet differentials.

Motor Protect is developed for the modern 4-stroke petrol and diesel engines with or without turbochargers installed. It is considered safe to be used with catalytic converters and since it has no solid solvents present inside, therefore, poses no threats to the diesel and gasoline particulate filters. It is also workable with the newly designed “Belt-in oil” belt system of lubrication but is not compatible with the wet clutches. It can be mixed with all of the mineral and synthetic-based motor oils available on the market.


Cera Tec is a suspension as it has microscopic boron nitride ceramics suspended in the solution containing chemical friction modifiers. These particles are responsible for the beige color of the additive suspension and are present in the foam of solid solvent which does not completely dissolve in the chemical solution of friction modifiers.

Motor Protect is an oil-soluble additive that only has chemical frictions modifiers along with the high-pressure anti-wear additives which are developed using the latest technology. There are no solid solvents present, therefore, it’s a solution and can completely dissolve in the motor oil.

Cera TecBN (Boron nitride) micro ceramics
Motor ProtectAdditives/ Synthetic base oil


Cera Tec uses its micro-ceramic boron nitrate particles to fill up the small pits and bumps over the surface of metal parts inside the engine. This causes its outer surface to be flattened out and the friction modifiers contribute by forming an extra chemical layer above the ceramic layer. This prevents metal-to-metal contact and reduces the chances of friction production since the surfaces are smoother now this, in turn, decreases the wear and tear inside the engine.

Motor Protect, on the other hand, uses its advanced high-pressure anti-wear additives which chemically form a very thin layer over the surface of the metal. This surface is then reinforced by the friction modifiers which makes it resistive and sturdier. This layer offers sliding and deformative capacity, meaning it acts as a sacrificial pawn under the wearing conditions.

The advanced anti-wear additives and the friction modifiers of the Motor Protect perform better relatively as they have better capability to reduce friction which is the prime reason for wear and tear.

Performance Analysis

The Cera Tec has a slight advantage over its adversary in terms of viscosity as its density at initial temperature is slightly higher. When it comes to resisting the high-temperature vaporization, this suspension lacks behind since its flash point temperature is way lower than that of its competitor which causes it to vaporize and consume earlier, even though the ceramic particles available inside can withstand a temperature up to 2192°F. It also freezes at a much higher temperature in comparison with its counterpart since its pour point temperature is much higher.

Motor Protect loses the competition in terms of viscosity as its initial density is slightly lower but the same is not true for its resistance against vaporization. The high flash point temperature of this additive solution indicates its low vaporization rate and high thermal stability. It is due to its high-pressure anti-wear additives which are designed to counter high stress, making them durable. It excels in cold climates too due to its much lower pour point temperature, meaning that it will freeze at a much lower degree temperature.

AdditivesDensity at 68° F (g/cm3)Flash Point Temperature (°F)Pour Point Temperature (°F)
Cera Tec0.893> 100-4
Motor Protect0.869320-22

Comparison of Fuel Consumption

Fuel consumption is directly linked to the vaporization rate and wear reduction capability. Since Cera Tec has a comparatively higher vaporization rate due to a lower flash point temperature and is considered less effective in reducing wear, therefore, it will cause a higher fuel consumption.

While Motor Protect has a lesser vaporization rate due to a higher flashpoint temperature along with the better capability to reduce wear which makes it highly fuel-efficient. The less wear indicates reduced production of friction since friction causes wear. This means lesser power from the engine will be consumed to overcome this friction which in turn improves the fuel economy of the vehicle.

Longevity Assessment

Both these additives are effective for the same distance i.e., 50,000 Km. This means it’s a tie between both in terms of longevity. A higher range of kilometers shows their durability and reliability. It is recommended by the manufacturer to add additives with or shortly after an oil change for enhanced results.

AdditivesEffective Up to (kilometer)
Cera Tec50,000
Motor Protect50,000

Recommended Quantity

The quantity of additives to add to the respective volume of motor oil is also suggested by the manufacturing company. If you use them under or over the recommended limit it will provide inefficient performance. The additives which can enhance the higher amount of motor oil’s performance are considered better.

A one litter Cera Tec additive can enhance the anti-wear properties of a minimum of 9 to a maximum of 12 liters of motor oil whereas the same quantity of Motor Protect is only considered effective for 10 liters of motor oil.

This means that Cera Tec wins this competition since it can cater to a slightly higher amount of motor oil.

Additives (1 Liter)The volume of Motor oil catered (liters)
Cera Tec9 to 12
Motor Protect10


When considered budget-wise the Cera Tec is light on the pocket while Motor Protect is somewhat costly. Cera Tec is available commercially in bottles of 300ml whereas the Motor Protect can be found in the 500ml bottles. For comparison, we set the standard to 1 liter, so the liter cost of Cera Tec is about 114.97 US dollars while a liter of Motor Protect can be bought for 135.98 US dollars. The higher price of the latter is justified by its relatively better performance.

We recommend you buy Cera Tec as it is more cost-effective, the higher price of Motor Protect doesn’t justify its slightly better performance but if you are paranoid about the solid additives inside your oil then you may want to consider the expensive option.

Quick Summary

  • Both these products are manufactured by Liqui Moly as an anti-wear additive for cars.
  • Both these additives are fully compatible with all types of engines (diesel and petrol) and their add-ons.
  • Cera Tec uses BN micro ceramics as a base while Motor Protect uses both Additives and synthetic oil as its base.
  • Cera tec has dual working modes both physically and chemically whereas Motor Protects only acts chemically.
  • Cera Tec has higher viscosity but lacks in terms of vaporization loss and winter performance.
  • Motor Protect is more fuel-efficient.
  • Both are equally durable.
  • Cera Tec can cater to a higher volume of motor oil.
  • Cera Tec is cheaply available and is also cost-effective.