Some people don't do anything to sanitize the oak and have no problem. Some say that soaking in bourbon isn't even sufficient, but I didn't have a problem when I did it. When you use oak cubes, you want to leave the beer on them for at least 8 weeks, as it takes some time to penetrate all of the layers and maximize complexity. For oak chips, 1-2 weeks is all that is necessary.
Primary: Humulus Congestus
Bottled: Downdraught Imperial Stout, Barrel-Aged Residence Time Barleywine, Sea Smoke Porter
On Deck: Chocolate Peanut Butter Stout, S'more Porter, Barrel-Aged Residence Time Barleywine