The fuel shall be the reference fuel whose specifications ate given in Annex VI. If the engine is lubricated by a mixture, the oil added to the reference fuel shall comply as to grade and quantity with the manufacturer's recommendations.
In any case of dispute the fuel used shall be the reference fuel G20, specified in Annex IX a of Directive 70/220/EEC, as last amended, if the engine is labelled for the H-range of gases, or the reference fuel G23 if the engine is labelled for the L-range of gases, i.e. the fuel with the highest Wobbe for the relevant range ...
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