Increase of ecological requirements to emissions of car engines and toughening of operation terms of modem combustion engines require usage of various additives to petrols in larger scales.
Restrictions on sulfur content until 0,001 and 0,005% were set forth in Sweden for the Г time in 1991, and until present they are the strictest one. In 1993 the restriction of sulfur in fuel till 0,05 was applied in USA, in 1994 – in Canada, in 1997 – in Japan. Since 2000 dicsel fuel with sulfur content no more than 0,035% is applied. Supposedly, since 2005 sulfur content in fuel won’t exceed 0,005%. Along with decrease of harmful emission in exit gases, application of ecologically pure diesel fuels entailed a number of problems: breakdown of fuel pumps, due to decrease of lubricating ability of diesel fuels and .increase of corrosion activity, related with removal of surface-active substances able to form protective film.
In 2005-2010 stiffer norms on sulfur content are proposed: up to 10 ppm and polycyclic aromatic carbohydrates up to 2%.
Starting from 2000, the indicator of lubricating properties of diesel fuels under ISO 12156-1 at HFRR device is included in European standard regarding the diesel fuel EN 590, basing on it the norm is set forth: diameter of wear scar is no more 460 mkm.