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Frequently asked questions

You can find answers on frequently asked questions, how to choose correct lubricants and how to use them correctly.

What affects lubricants consumption?

Besides the condition of the engine, the lubricant consumption is affected by the viscosity of the used oil, the evaporation properties of the base oil, oil tank fill level and the driving style. Thinner oils usually evaporate more than thicker oil. As well, thinner  oils get more easily through gaps into the combustion chamber and through possible leaking seals. Driving style probably has the greatest influence on oil consumption. Driving at full throttle for a long time with frequent engine braking, increases oil consumption the most. In this case, the oil heats up and gets thinner. And the negative pressure of the engine braking pulls a lot of it into the combustion chamber through the clearances.

Can Biocoolant and regular Coolant be mixed together?

Yes, it is possible to mix, but testing equipment based on density can show the wrong frost resistance for the mixture. It is because the density of Biocoolant is much lower than that of regular coolant. 

Can Neste Brake fluid be mixed with other brake fluids?

Neste brake fluid exceeds the DOT 5.1 requirements. There are different types of brake fluids: DOT 5.1, DOT 5, DOT 4, DOT 3 and DOT 2. The main thing that differentiates the different grades of DOT brake fluids is their boiling points or temperatures.

DOT 4, DOT 3, DOT 2 and DOT 5.1 can be mixed without reducing performance or damaging the brake system because they are glycol based. DOT 5 brake fluids are silicone fluids. DOT 5 can replace DOT 3 and DOT 4, but it must not be mixed with other brake fluids.

What does gear oil classifications API GL-4 and GL-5 mean?

API classification for gear oils defines the anti-wear properties of the oil. The higher the number, the higher the amount of anti-wear additives in gear oil. Oils with the highest GL-5 class are usually used for the so-called rear axle of rear-wheel drive cars where high amounts of ant-iwear additives are needed. API GL-4 gear oils contain 2 times lower amount of anti-wear additives, compared to API GL-5 gear oils. Api GL-4 gear oils are usually used in the transmissions of front-wheel drive cars. The API class must be selected according to the car manufacturer's instructions. Using gear oils with a classification that is lower than recommended can lead to rapid wear of parts. On the other hand, using higher classification than requested can lead to poor synchronisation in manual gearboxes.

Can diesel engine oil be used in a gasoline engine?

Yes, it can be used if the oil also meets the API and ACEA classes required for gasoline engines or the car manufacturer's quality requirements. Check the classification requirement in the vehicle's user manual. Current synthetic passenger car motor oils are generally equally suitable for both gasoline and diesel engines, as well as turbocharged engines. Diesel engine oils intended for heavy duty vehicles and work machines are not suitable, at least for newer gasoline engine cars.

Can gasoline and diesel engine oils be mixed together?

Engine oils made for the same application and meeting the same quality classifications, such as Neste Pro and Neste Turbo NEX, can be mixed together, whether they are single or multi-grade. On the other hand, mixing oils intended for different uses, for example diesel and gasoline engines, is not recommended. However, the best way to ensure that the lubricant does not lose quality is to use the same oil throughout the change interval.

Why is an oil change important?

During vehicle operation, the properties of the oil gradually deteriorate, lose its performance and the amount of impurities increases. A sufficiently frequent oil change removes impurities from the engine and replaces it with high-performance oil. Additives in the engine oil provides, for example, engine cleaning and corrosion prevention, which reduces wear and extends the engine's service life. In addition, the high-performance oil keeps both the engine and the catalyst in good working condition. This results in cleaner exhaust gas emissions and lower fuel consumption.

How often should the engine oil be changed?

The oil must always be changed at the latest after the mileage specified by the car manufacturer. Winter driving, short driving distances, dusty conditions, etc. require even shorter change intervals. Changing the oil frequently enough is the cheapest way to extend the life of the engine.

Do some oils tend to have higher consumption?

Thin oil consumption is higher than thick oil. This is the rule, but sometimes there are exceptions, e.g. when switching from one oil quality to another, higher consumption may occur during the first change interval. Even a new engine that has not been run, often consumes more oil than normal. All in all, the engine must consume a little oil, but it gets enough lubrication from a sufficient amount of oil.

What do the SAE, API and ACEA engine oil classifications mean?

The SAE classification indicates the oil's viscosity, i.e. flowability. The lower the class number, the thinner the oil. The API and ACEA classifications define the oil's suitability for different engines such as gasoline and diesel engines. The classifications also determine whether the intended engine is, for example, turbocharged or naturally aspirated. The classifications are explained in the attached Vehicle lubrication guide.

Where can I get more information about lubricants?

Neste lubricants product technical advice will help you with questions related to lubricants.

Why is it important to use high quality engine oils?

High-quality engine oils are good investment: choosing the right lubricant can mean saving thousands of euros in maintenance and operating costs. In nordic conditions, vehicles are subject to severe stress over the course of a year. Lubricating oil is the engine's first line of defence against wear and tear. Engine oils performs in the engine in many ways: lubricates it, seals seams, cools and binds dirt.

Neste's assortment includes a wide selection of different SAE class oils, although several companies using heavy-duty equipment are moving towards thinner engine oils. The use of thinner engine oils facilitates, among other things, the cold start of the vehicle and reduces fuel consumption.

How do I choose the right lubricant for my equipment?

Choosing the right lubricating oil should be done carefully. Neste's Lubricant Advisor service helps you find the best lubricants from more than 200 car brands and more than 12,500 different types of vehicles by application. The advisor also provides vehicle-specific service information. Lubricants advisor can be found by this link:


What does the tightening of emission requirements may mean for my company?

Trucks and buses account for about a quarter of the EU's road traffic carbon dioxide emissions, which corresponds to an average of 6% of the EU's total emissions. In the EU-wide carbon dioxide and emission standards for heavy vehicles approved in 2019, goals were set for, among other things, reducing the average emissions of new trucks in 2025 and 2030.

From 2025, manufacturers must meet the average CO2 emissions targets for their new trucks registered in a given calendar year: 

- From 2025: reduction 15%

- From 2030: reduction 30%

The carbon dioxide emission standards cover large trucks, which account for 65-70% of all heavy vehicle carbon dioxide emissions.

Any possible solutions are needed to reduce emissions. With Neste MY renewable diesel intended for road traffic, the company can immediately reduce its own emissions, up to 90%, compared to fossil diesel. In addition to that, the use of the right lubricants is also important: Neste's renewed diesel engine oils, for example, have longer change intervals than before, which saves on the consumption of raw materials.

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