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FAQ

  • What is the cetane number?

    The cetane number is one of the basic indicators of diesel fuel quality; this parameter shows the combustion speed of diesel fuel and it is inversely proportional to the time between the moment of ignition of fuel and the increase of pressure in the combustion chamber. The higher the cetane number, the shorter the above time and the more smoothly the engine will run. The cetane number also affects the engine’s cold start performance, exhaust emissions and noise during engine operation.

  • How important is the purity of the fuel?

    The purity of the fuel simultaneously means instant savings, better engine performance and reduced deposits that in the long run result in significant wear and maintenance costs, respectively. In diesel engines, especially modern direct injection common rail engines, the injection system, the pumps and the entire fuel circuit are extremely sensitive to the presence of particles and water.

    Another important factor that can affect engine performance and cause harmful deposits in the injection system (injectors), is the formation of deposits from combustion and crystallization of the fuel (paraffin formation) that may occur during the winter months because of low temperatures.


  • What are the lowest temperatures at which Jugopetrol diesel fuel can be used?

    It is a natural characteristic of diesel fuel to experience the precipitation of paraffin wax at low temperatures, which makes engine operation more difficult or impossible. The lowest temperature at which fuel can be used smoothly is called the cold filter plugging point (CFPP), which is the temperature at which fuel does not pass through a standardised filter of a specific diameter, due to paraffin formation. The CFPP is standardised for the whole territory of Montenegro, meaning that fuel at all Jugopetrol AD petrol stations is of the same quality. The prescribed CFPP for the winter season is -15 0C, and Jugopetrol supplies diesel fuel with a CFPP between -18 and -20 0C, which makes it completely suitable for use in all areas of Montenegro.

  • What is the octane number?

    The octane number is one of the basic indicators of gasoline quality. While in the combustion chamber, gasoline is exposed to high temperature and pressure, which can lead to the self-ignition of fuel, which is manifested as engine knocking and causes damage to the engine. The octane number shows the resistance of gasoline to self-ignition. Its name is derived from the hydrocarbon octane, which is highly resistant and is taken as a reference, its assigned octane number being 100. There are several methods to determine this parameter; the Montenegrin standard prescribes the research octane number (RON). Modern engines require gasoline with an octane number of 95, and Jugopetrol offers RON 95 and 98 gasoline, both ratings being unleaded.

  • Is all unleaded 95 octane petrol the same?

    95-octane petrol should meet the requirements of European standard EN 228. That said, each petrol acquires its own performance characteristics during use, depending on the technology of specific additives it contains. At Jugopetrol, the choice of diversification technology of unleaded 95 (RON) petrol, focused on ensuring the lowest possible fuel consumption depending on the driving style and the cleanliness and longevity of the engine without this cost burdening the end consumer. The combination of all these features led to the design of unleaded petrol 95 EKONOMY.

  • What are the differences between 95 and 98 octane gasoline?

    Gasoline with an octane rating of 98 is more resistant to self-ignition than gasoline with an octane rating of 95. 98-octane gasoline is generally thought to give more power than 95-octane gasoline. However, an engine designed for 95-octane gasoline, with the average passenger car characteristics (e.g. acceleration from 0 to 100 km/h in about 10 secs or less) will not have more power with 98-octane gasoline; however, a high-performance sports engine will not be able to develop its full power if it runs on gasoline with a lower octane rating that is not able to sustain the high pressure and rpm of such engine types.

    Therefore, a higher octane number does not imply more power—since power is conditioned by the engine’s design characteristics—but only a more efficient performance at higher rpm.

  • Does the use of 98-octane petrol increase consumption?

    The correct answer to this question depends on the use in terms of driving style and the car type. In other words, the new generation aspirated engines with high compression ratio, have better combustion, and therefore have a reduced consumption with much better performance, especially on roads outside the city. The Euro super 98 petrol keeps your engine clean by reducing the formation of deposits in the valves, ensuring excellent cleaning results in Direct Injection Spark Ignition petrol engines. Moreover, with advanced additive technology that it contains in combination with the increased octane number, the Euro super 98 petrol significantly reduces friction while achieving high performance and economy in fuel consumption.

  • Which engines benefit more from using 98 octane gasoline?

    The optimum octane number of gasoline is determined by car manufacturers for any specific engine, and such label is usually found on the car’s filler flap. Regardless of the octane number of gasoline, its performance depends on the engine in which it is used. Engines designed to run on 95-octane gasoline will certainly not suffer any consequences if they use 98-octane gasoline, but no significant benefits have been proven either. However, engines designed for 98-octane gasoline or engines modified to increase power must not use gasoline of a lower rating. A long-term practice of this kind can cause damage to the engine, due to the occurrence of engine detonations described above.

  • How to drive more km with the same amount of fuel?

    Drive with constant speed instead of constantly changing it. Accelerate smoothly with low gas pressure. Plan your trips and avoid traffic. Maintain your vehicle frequently and keep your tiers appropriately inflated. Reduce the use of the air conditioner. Drive through asphalted and suitable roads that save energy and reduce the fuel waste. Use the right octane petrol for your car and the best quality fuel we provide for you.

  • Fuel additives can be find at the petrol stations; are they efficient?

    Fuel additives can be useful if used properly. It is necessary to carefully read the additive manufacturer's instructions, check the type of vehicle for which they are intended, check for restrictions on use by the car’s manufacturer, and adhere to the recommended method of application and dosage. Any improper use or application of inadequate additives can cause more harm than good. If properly applied, additives will not have any adverse effects, but depending on the condition of the engine, the improvement may be less than expected or there might not even be any.

  • What should I do if diesel and gasoline are mixed?

    If you have refuelled your car with a wrong type of fuel, do not try to ignite your car, but call a tow truck service instead and arrange for the tank to be emptied at an appropriate car service centre. In case you have already started your car, turn it off as soon as possible. By doing so, you will prevent the contaminated fuel from reaching the engine, where it cause considerable damage, especially in newer engines, where fuel is computer-dosed and sensors are sensitive to any impurities in the fuel.

  • A mechanic has suggested that I add motor oil or used motor oil in the fuel to improve the engine’s performance; is that OK?

    This suggestion was common with older vehicles as oil was believed to improve combustion by ‘lubricating’ the piston rings of the engine. However, oil combustion impedes engine performance and causes malfunctions in other components, which is why adding oil to the fuel is by no means recommended; especially not in newer vehicles, whose injectors and sensors are sensitive to impurities. Jugopetrol diesel fuel has already been conditioned at the refinery to contain all the necessary components for reliable engine operation.

  • A mechanic suggested that I add gasoline or kerosene in diesel in order to prevent the freezing of fuel during winter; is that OK?

    It is true that adding gasoline to diesel lowers its CFPP, but it will also lower the ignition point, which can cause damage and even fire in the engine, so this is by no means recommended. Jugopetrol’s high-quality diesel fuel can be used at temperatures which are lower that those prescribed by the standard, but if you believe that even that will not be sufficient for the location where you are traveling, you can try the anti-freeze additives available at our petrol stations. These additives react with paraffin crystals, affecting their shape and size, making it possible for fuel to flow at lower temperatures. For an efficient performance, additives must be added to the fuel prior to paraffin formation.