Engine system and operating strategy forming engine starting charge

A method of operating an engine comprising:

• admitting an additive into a fuel delivery system for an engine so as to produce a dosed fuel in the fuel delivery system;
• consuming a leading fuel from the fuel delivery system via operating the engine so as to advance the dosed fuel through the fuel delivery system;
• shutting down the engine so as to form an engine starting charge of the dosed fuel in the fuel delivery system;
• and
• starting the engine operating on the engine starting charge of the dosed fuel.

An engine system comprising:

• an engine operative to combust a fuel;
• a fuel injector operative to inject the fuel into the engine at a fuel injection location;
• a doser operative to dose the fuel with an amount of an additive to increase a reactivity of the fuel;
• a controller configured to:
• cause the fuel injector to inject the fuel into the engine;
• cause the doser to dose the fuel with the amount of the additive;
• and
• shut down the engine after operating the engine at least one of a time duration or a number of engine cycles expected to advance the dosed fuel to the fuel injection location.