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One more official service bulletin by Wartsila, this one dedicated to he use of the distillate fuel. The company allows for the engine produces to be operated on all fuel oils supplied under the ISO 8217 spec. The existing and foreseen legislation addressing marine fuels is actually limited to prescribing the max content of sulphur or to reducing the sulphur content in the exhaust gases with alternative methods of equal effectiveness. The present document deals with the minimum viscosity of marine fuel, use of distillate fuels, selection of the cylinder oil, change-over procedure, arrangement of the fuel oil system, ISO 8217 fuel standard. Official release by Wartsila Switzerland applying to both RTA and RT-Flex engines.