Refiner Motor Oil will shut its Aghioi Theodoroi plant for a week, at the end of March, for the installation of a hydrocracking unit and other planned maintenance work, a senior official said yesterday. «The exact date is being currently fine-tuned. We are planning to do everything simultaneously so as to have the minimum disruption,» Financial Director Petros Tzannetakis told Reuters. He said the 105,000 barrels per day plant will shut down completely for a week while different units will be closed down for two to three weeks between mid-March and mid-April for planned maintenance work. «The whole refinery will be back in operation within April,» Tzannetakis added. The refinery is the second largest in Greece. On the company's 340-million-euro project to upgrade the refinery, which includes the hydrocracking unit, he said work is expected to be completed in the third quarter of this year.