FWIW, same engines on a Global, the limitation is "for flights over three hours, oil quantity must be full". An operator at recurrent once told the story of his tech team kept them at 9.3 QT level on the panel quantity gauge. South of Iceland one winter night, both (
) OIL QTY LO messages came on. When they landed at Luton, both engines needed about 5 quarts, IIRC. you really have to understand the upper/lower oil chambers and the gauging system before you play with oil servicing levels. I don't leave without 10.2 quarts.
GF