A leather oil should be used on your leather case cover from time to time, as for any fine leather product. This acts to lubricate the leather by replenishing natural oils, and is especially useful at all stress points. Pecard’s dressing is petroleum-based, which is far better than animal based products, since there is no risk of mold or microorganism infestation. A light coating a couple times a year, with a little more at the stress points, should be great insurance.