Prémiová paliva
Press Release
Verva Diesel by Benzina excels in a long-term test by AutoDiesel magazine [28.04.2010]
Prague, 15 April 2010 - AutoDiesel magazine carried out a long-term test of Verva Diesel premium fuel, launched on the market by Benzina, on a Kia Cee'd 1.6 CRDi. From September 2008 when the test began to March 2010 the magazine's staff drove 90 000 kilometres on Verva Diesel. During the test the car underwent many checks whose results were better than the carmaker's recommendations.
After 70 000 kilometres the Kia Cee'd had an engine performance of 94.5 kW and a torque of 269 N.m., while the carmaker lists values of 85 kW and 240 N.m. "After 87 000 kilometres we took out one of the injectors and carried out a precise control of its condition", says Martin Vaculík, the editor of AutoDiesel, and adds "Bosch Diesel Centres have technology to evaluate the condition of the injectors. At the testing station the amount injected, the flow rate and the response time are checked. The results for the car tested were 100% positive." At full load the carmaker lists the amount injected as 55.4 mm3 with a tolerance of 6.9 for the Kia Cee'd. "The test measured 57.0 mm3, from which it's clear there was no coking of the nozzles. The other parameters were also fine," reveals Martin Vaculík.
The CEC F-98-08 test method states that when using fuel with a 6% bio content, after 32 hours at full load the nozzles' flow is reduced so much that engine performance falls by 10%. Our tests revealed that the cleaning additives in Verva Diesel by Benzina entirely eliminate the negative impacts of the obligatory bio additives.
Verva Diesel also revealed its outstanding properties in engine combustion. "The engine control unit corrects any poor combustion in any of the cylinders by increasing the amount injected. The maximum difference between individual cylinders is 5 mg, but for the car tested it was 1.3 mg. A check of a dismantled injector under a microscope did not reveal any wear and tear," the magazine's editor adds.
Another car was also used in the test, a Mercedes-Benz E270 CDI provided by one of AutoDiesel's readers after it had clocked up 258 000 kilometres. From the start it had exclusively used Benzina TopQ fuel, and since 2007 it had run on Verva Diesel.
Martin Vaculík comments on the test: "Even after so many kilometres the injector tested was as good as new. The difference between individual cylinders was 1.3 mg, while the car maker sets a limit of 5 mg for wear and tear. According to the carmaker's original testing plan the injector is just as good as when it was new. The maximum prescribed amount is 63.4 mm3 with a tolerance of 5.5, but we measured 60.0 mm3." Nor did a check of the injection nozzles under a microscope reveal any wear and tear. "Our conclusion was that Verva Diesel proved its claimed positive effects on engine performance, but also on the cleanness and wear and tear of the injection system."
Verva Diesel was developed with the aim of improving engine performance in various climatic conditions and environments with variable loads, and it has been a hit among drivers. "When developing this top-quality fuel we used a new special formula with modern additives, making Verva Diesel one of the best fuels on the Czech market," says Václav Loula, head of Benzina's Quality Division. The standard range of additive fuels has been gradually extended with a collection of premium fuels: in October 2006 100-octane Verva petrol was introduced, followed a year later by Verva Diesel.
Verva Diesel is particularly recommended for cars with modern diesel engines equipped with common rail technology. The higher cetane number for this diesel (60 compared with the usual 51-53) increases the efficiency of the engine and makes it easier to start. It reduces friction losses and achieves full engine performance, as well as making it more economical to run the engine. Increasing the cetane number reduces carbon monoxide emissions as well as solid particles, and also cuts engine noise. Verva Diesel's higher lubricating qualities significantly improve the protection of the fuel pump and nozzles. Verva Diesel demonstrates better low-temperature properties in extreme frosts, with filterability to as low as -26 ºC.
