Originally Posted by IXVolt
Oatmeal is also great for mouthfeel and body. Not sure if you can steep them or not, I use them in all grain batches...
Sure you can steep oatmeal! Matter of fact, I'd recommend steeping it and squeezing the tar out of the grain bag. It is one of few adjuncts you can do that with. Put it in a separate bag, as squeezing your specialty grains can impart a certain astringency to your beer.
Regarding maltodextrin, 10-15 minutes is perfect.