The Czech technical standard ČSN EN 590 specifies low-temperature properties according to the season.
During the winter, i.e. from 16 November to 28 February, filling stations offer EFECTA Diesel class F with a filterability quality parameter of -20 °C. During the transitory period, i.e. from 1 October to 15 November and from 1 March to 15 April, filling stations offer EFECTA Diesel class D with a filterability quality parameter of -10 °C.

* Filling stations must provide winter diesel oil class F for temperate climates with a filterability parameter of -20 °C from 1 December.

The filling station network has introduced the "Quality Seal" system, telling customers about the periodical and independent inspections of the fuels on sale. Each filling station is inspected at regular intervals by an independent accredited external laboratory. The results of the inspections are processed using statistic methods.
The long term development of the quality of fuel sold at BENZINA, s.r.o., has shown very good and stable results.
In 2013, all controlled automotive petrol in the Quality Seal system had 100 per cent quality; 99.9 per cent of Diesel TOP Q samples collected and analysed by the independent accredited laboratory were also free and clear. Besides this fuel quality monitoring, the quality of filling stations was attested by the results of State inspections carried out by the Czech Commercial Inspection (ČOI) authority in accordance with the Ministry of Industry and Trade By-law No. 229/2004 Sb. According to this authority, too, BENZINA, s.r.o., achieved very good results, especially because in 2006, during its nationwide monitoring, ČOI found 4.8% cases
of non-compliance in general, but none was found in BENZINA, s.r.o.
ČOI inspects all public filling stations in the Czech Republic with the exception of non-public "courtyard" sales.