I'd like to add 8 ozs. of instant oatmeal to a porter extract recipe, but I'm afraid the 0.5 lb lb. of 60 crystal, 0.5 lb. of chocolate malt, and 0.25 lb. of black patent malt I'm going to steep with wouldn't have enough diastatic power to convert the starches in the oatmeal.
Advice please, and thanks in advance for your comments.