Hi again, Is that necessary to change yearly the engine oil of a 348, as said in the owners manual ? I've done the major service a year ago ang have done 8000 Km. Every 1000 Km (more or less) I've to join some oil (between 500 cc and 1 litre). If your answer is yes, what about the gearbox oil and the water coolant, must be changed yearly too ? Nuno Maia.