Change comes slowly in Rioja. Many of the winemaking practices that were in place when the region was established in the third quarter of the 19th century are widely used today. Grapes are pressed traditionally and most of the best wines are aged, sometimes for many years, in oak barrels of various sizes, with a preference towards American oak. Many winemakers see oxidation during aging as an asset, not a flaw, that when done correctly, brings the unique perfume, complex flavors and supple texture that make serious Rioja among the world’s greatest wines.