Frequently Asked Questions

Who produces NISOTEC and G-Energy lubricants?

NIS Gazprom Neft owns the NISOTEC brand which is produced in the Lubricant Oil Blending Plant of the Novi Sad Oil Refinery. This product belongs to the standard oils category. Gazprom Neft owns the G-Energy brand produced in Bari, Italy. This product belongs to the premium brand group.


Why should I use NISOTEC?

The most common misconception is that all lubricants in the SAE viscosity grade, ACEA, API or in any other ratings are the same. However, they are not. Some oils barely meet the minimum requirements. Other oils are significantly above the required standards. NISOTEC oils perform far beyond the required, due to careful selection of top quality base oils and additives controlled during the strict laboratory analysis. Lubrication efficiency depends mostly on the ability of oil to create and, most importantly, keep a strong enough oil film. They are produced to meet several important requirements simultaneously. They must reduce friction and wear, maintain engine cleanliness, keep the engine cool and sealed. Oils should be able to perform these actions for several hundred hours of operations in various working conditions.


How important is to change the oil filters in time?

Each hour of operation brings impurities to the oil. This is why engine wear increases closer to the end of the service period. If the oil is not changed, severe damage could occur, such as piston ring and transmission gear wear. Oil filter must be replaced during the oil change. An old oil filter decreases the effectiveness of new oil. A clogged oil filter prevents circulation and could cause overheating and damage to the engine.


What are the benefits of NIS lubricants?

They do the following:

  • increase engine effectiveness 
  • lengthen the life of the engine 
  • ensure lower fuel consumption, as a result of reduced friction 
  • help with cold starts (20-30% of engine wear happens in the time before the engine reaches operating temperature) 
  • economical

How often should engine oil be changed?

Oil change is essential to vehicle maintenance. Engine oil collects particles (combustion residue, metals etc.) and is less efficient due to blending with water or fuel, oxidation, additive consumption, and this is why it needs to be changed at least once a year.

Recommended oil change intervals differ depending on the following:

  • oil quality,
  • driving (open road, city),
  • engine integrity and
  • operating conditions 

The volume of oil should be in the middle of the scale, between the minimum and maximum allowed volume, of the dipstick. This difference is approximately 20% of the volume. This means that, if the oil is low, it works 20% more with fewer additives, causing quick circulation of fluids and accelerated degradation and engine wear due to insufficient lubrication and cooling.

Regular control, after 1.000 km is recommended, especially after longer trips.


What do UHPD and SHDP mean?

UHPD (Ultra High Performance Diesel) is top diesel engine oil in the European Union market. The viscosity of oil is SAE 10W-40 and it matches the ACEA ACEA Е4-08 European Union standards. UHPD Low SAPS – ACEA Е-6 (vehicles with DPF and UHPD high SAPS ACEA Е4 (longest oil change interval for vehicles without DPF).

SHDP (Super High Performance Diesel) is premium oil used in moderate and heavy-duty working conditions. This category is subdivided in two performance segments and ACEA Е7-08 (High SAPS) and ACEA Е-9-08 (Low SAPS). SHDP oils have the SAE 15W-40 grade level. 


What are the benefits of synthetic oils?

The high viscosity of synthetic base oils provide an extremely stable viscosity disregarding the operational temperature. This is what gives them advantage over mineral oils produced from conventional base oils requiring large amounts of additives to improve the viscosity. Stability of the engine oil at all temperatures guarantees the optimum efficiency both in cold starts and extremely high temperatures. This ensures maximum engine load in extreme conditions. Synthetic oils provide better oxidation resistance, extending the life of the oil, thus guaranteeing extended life of the engine. The engine cleanliness reduces engine wear. Synthetic base oils ensure production of low viscosity (better flowability) and low oxidation engine oils, providing economic benefit - lower fuel and oil consumption.

Consequently, by selecting synthetic engine oils, one gets technologically advanced, efficient, long-lasting oil with reduced consumption. By using synthetic oil we act in accordance with the principle "Expensive is cheap".


Why is oil viscosity important?

The viscosity of a fluid is a measure of its resistance to gradual deformation by shear stress. The lower the viscosity, lower the resistance, resulting in smaller losses in engine power. The higher the viscosity, the better wear protection of the engine is. The viscosity should be the compromise between these two requirements. These are the advantages of top-quality oils, having a relatively constant viscosity in a wide range of temperatures. Engine oil viscosity is expressed in SAE grade.


Is synthetic oil good for any engine?

If a mineral oil was used in accordance with engine manufacturer's recommendations, the engine is probably covered in soot and residue.

High quality oils, such as synthetic, have intensive detergent and dispersive properties, meaning they would wash out the soot and residue. After collecting all the impurities, the oil will be dirty and dark in colour. Washed out soot and residue will block the filter and oil lines, which might lead to engine damage. This oil, and the filter, should be replaced with fresh synthetic oil. The operation will significantly extend the change interval.

Always act in accordance with the manufacturer's recommendations.


Is it alright to mix mineral and synthetic engine oils?

They could be mixed if the synthetic oil is based on poly-alpha-olefin (PAO). Nevertheless, this is not recommended due to the additives used in production of mineral and synthetic engine oils. The mix should not be a problem, but the end-result is unpredictable. It is better not to mix oils, because the mineral oil could degrade the properties of the synthetic oil.


Can car engine oil be used in a motorbike?

No, four-stroke engines operate differently than motorbike engines. Motorbike oil could be used for transmission and the clutch, which requires extreme pressure additives. On the other hand, car engine oils contain detergent additives with high ash content. If used in a motorbike engine, they could damage the piston and the gear.


What is the usual consumption of engine oil?

An engine usually consumes lower volumes of oil, which requires regular control and refill between two oil changes. Smaller volumes burn out, and larger volumes evaporate. Under normal operations, the engine consumes between 0.2 and 0.5 litres of oil per 1,000 km. If the consumption goes above 1 litre per 1000 km, contact your authorised service centre.

Regardless of regular refilling, oil should be replaced within the prescribed date. Oil change interval should not be extended.


How long can lubricants be stored?

If the lubricants are kept closed and protected from air, moisture, sunlight, heat, etc. Recommended keeping time is 5 years. After this period, laboratory tests should check the quality of the lubricants. If the lubricant is of satisfactory quality, storage can continue.


What is the price of engine oil?

Lubricant costs are less than 1% of total maintenance costs (fuel, tyres, maintenance, registration, etc.). This is why there is no reason to save money on lubricants. On the other hand, the quality of oil significantly affects total maintenance costs and saves money.


What is TBN?

TBN means Тotal Base Number  and it is the base reserve of the engine oil. TBN determines how effective the control of acids formed will be during the combustion process. The higher the TBN, the more effective it is in reducing the corrosive effects of acids over an extended period of time. In the presence of sulphur during the combustion process, highly corrosive sulphuric acid is created, but this acid is neutralised by the base reserve in the engine oil.

The TBN is one of quality indicators for engine oil. Different additives may increase the base reserve, but also affect the ability of oil to neutralise acids. High base reserve is important for fuel with high sulphur content. 


How does engine oil impact fuel consumption?

Simply, the engine is lubricated by a pump which sends oil to critical points in the engine and creates a protective oil film between the moveable engine parts. This oil film separates metal surfaces, prevents direct contact and reduces wear. However, not all oils are the same. Flowability and the ability to reduce friction are different. Engine oils that require less power of the pumps and that reduce friction do reduce energy losses of the engine. Top quality multigrade oil may reduce fuel consumption by 2-3%, compared to monograde engine oil.

Lubrication of other parts (wheel bearings, transmission, and differential) could lower fuel consumption. By using top lubricants for all the mentioned elements, fuel consumption could be reduced by additional 5%.


Why does the colour of oil change to black in time?

Engine oils are produced to prevent wear and keep the engine clean. Oil removes impurities (soot and combustion residue) and keeps them dispersed using additives like detergents and dispersants. The black colour of oil shows that the task was successful and particles collected.


Why should engine oil be changed regularly?

Irregular oil change could damage the engine. Oil and additives are spent even in normal operating conditions. Oil degradation is inevitable. The time needed for oil to lose its properties depends on oil itself, and on driving, weather conditions and engine make. The life of the engine is extended with timely oil change.


What is the most convenient temperature for removing old oil?

At operating temperature, oil will be disposed more quickly and effectively, than if the engine were cold. In room temperature, oil is thick and it stays on the engine walls. Moreover, it stays in all horizontal surfaces of the engine. By trying to dispose of oil at room temperature, only 60-70% of oil will exit the engine. At operating temperatures, the number is 90-95%. When changing oil, the oil filter should be replaced as well. An old filter is like a sponge: it collects old oil, dirt, metal particles and other impurities.


How can one be sure the engine oil is genuine?

Without laboratory testing, this is very difficult. Forgers of labels and packaging are very competent, and visually, there is no clear difference. Visually, non-genuine oil is difficult to single out. Oil quality can be determined only by laboratory testing. However, sometimes the laboratory tests show good results, but when non-genuine oil reaches operating temperature it dissolves and ruins the engine.

Non-genuine oil takes various forms: pure base oils with no additives, distillates, raffinates, used oils mixed with cheap base oils. Then they are packed in "original" packaging of any manufacturer. How could one be protected from non-genuine engine oil? Very simply. Oils should be bought at reliable locations such as NIS Petrol stations. Do not try to save a few euro cents and end up with hundreds of euro worth of damage.