Can I mix 5w20 and 5w30 motor oil in my car or truck? If that may be a question of your respective head, the just one-phrase respond to is Sure, you'll be able to. Now,  the problem is, how can you combine both of these oils, as they are designed to be two grades of oil. On the other hand, we've been here to clarify to you all…one. To file a gua