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  • What is cetane?

    Cetane number is an indicator of the combustion speed of diesel fuel. The higher the cetane number the more easily the fuel will combust.  Cetane number also affects the cold start of an engine, emissions and noise in the combustion chamber. The high cetane number ensures control of the ignition time in exhaust gas recirculation (EGR) diesel engines.
  • How important is the purity of the fuel in Diesel?

    The purity of the diesel fuel simultaneously means instant savings, better engine performance and reduced deposits which 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.
  • The quality certificate of OKTA states that the filterability of the diesel has the score of -6. Does this signify that the diesel is not in accordance with the limit values prescribed by the standard?

    The filterability point determination (CFPP) is used to estimate the lowest temperature at which the fuel will flow through the oil line.
    The lower the point, the easier the fuel passes through the filter, and clogging is less likely to occur.
    According to the MK standard, different periods of the year have differing points of filterability.
    During the summer period (15th April – 15th October) the maximum allowed value is 0˚C, meaning CFPP ≤0. A minimum has not been prescribed. In our case (CFPP = -6) that means that we have delivered fuel with superior quality to the one prescribed by the MK standard. 
  • What is octane?

    The name comes from the presence of eight carbon atoms per hydrocarbon molecule. The octane number (RON = Researched Octane Number) is the measurement of the petrol's ability to resist spontaneous combustion. The spontaneous combustion can cause engine knocks, known as ‘pinging’ sounds which can cause engine damage. Modern petrol engines are adjusted to a specific octane number. When petrol of a lower than normal octane number is used, it causes knocks. Engines equipped with special knock sensors can handle lower octane fuel, slowing down combustion time. At the same time, fuel consumption is increased and engine performance is reduced, worsening driving experience. By using petrol with a higher octane number than the minimum, fuel consumption is reduced and engine performance is improved.
  • 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 OKTA, 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 Eurosuper BS 95.
  • What are the differences between 95 and 98 octane petrol?

    The difference in octane number is perceived as combustion quality and performance that is required by your car’s engine. If petrol with lower octanes than those recommended by the manufacturer is used, knocks may be heard in your car's engine. This is the knocking phenomenon (i.e. pinging sound), the consequences which were detailed above.
  • 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 ЕKO Racing 100 petrol – ОКТА 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 which it contains in combination with the increased octane number, the EKO Racing 100 petrol - ОКТА 98 petrol significantly reduces friction while achieving high performance and economy in fuel consumption.
  • Which engines benefit more from using 98 octane petrol?

    All direct injection engines, whether are turbocharged or natural aspiration, benefit from the use of high octane petrol because they present a higher geometric compression ratio compared to an indirect injection engine.
  • How can I be sure that the 98 octane petrol is really 98 octane?

    Currently, ОКТА is the only company in the local market that has the Quality & Quantity Guarantee Program. OKTA has spot test kits, so when refueling the consumer can personally check if the petrol is actually 98 octane or 95 octane which is the usual impurity. The specially trained staff can help the consumer to perform the on-site test.

  • 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 which save energy and reduce the fuel waste. Use the right octane petrol for your car and the best quality fuel we provide for you.