Metal sheet having oiled Zn—Al—Mg coatings

A metal sheet comprising:

• a substrate having two faces, each face hot dip coated with a metal coating comprising zinc, aluminum and magnesium, the metal coatings comprising between 0.1 and 20 wt % of aluminum and 0.1 and 10 wt % of magnesium;
• layers of magnesium oxide or magnesium hydroxide formed on outer surfaces of the metal coatings, the layers being altered by applying mechanical forces using a roller leveler, a brushing device, or a shot-blasting device on the outer surfaces of the metal coatings,
• wherein the layers of magnesium oxide or magnesium hydroxide are cracked by applying mechanical forces on the outer surfaces of the metal coatings;
• and
• a layer of oil deposited directly on the outer surfaces of the metal coatings having altered layers of magnesium oxide or magnesium hydroxide.