This is what BYO says about soaking cubes, but indent hink any of the mentioned are close to old ales.
Two weeks before racking, take 3.0 oz. (85 g) of oak cubes (French oak, medium toast) and soak them in wine. Use Chardonnay for the Temptation clone, Pinot Noir for La Roja, Cabernet Sauvignon for Darth Porter and Burgundy or Meritage for Grand Cru and La Folie. Change wine every 3 days to lessen the intensity of the new oak.