The British Standard for Industrial Fuel Oils, BS2869:2010, contains two grades of gas oil: Class A2 or 10ppm sulphur gas oil, this is a now a legal requirement for off-road, mobile plant, and Class D. The second is 1000ppm sulphur gas oil, which can only be used in stationary diesel generators and heating applications.
The standard form of gas oil at most refineries is now 10ppm sulphur or Ultra Low Sulphur Gas oil, which can be used for both off-road, mobile plant and for stationary plant.
Ultra low sulphur gas oil in most cases can contain an element of bio-diesel which can attract water, making the product more susceptible to degradation in storage and plant , causing failure due to water build up or blocked filters.
Superheat 35 MUST NOT to be used as a road fuel or as a fuel for any other engine, motor or machinery. Superheat 35 meets BS2869:2010 Class D for heating applications.