It is okay to mix brands of oil as long as you use the right viscosity (10W-30). With some cars, there are moving parts right under the oil cap that can lead to spraying if you run them with the oil cap off. With other cars, that leaving the oil cap off doesn’t expose any moving parts and oil is unlikely to spray out. Is that the case with your Caravan? What do you see when you remove the oil filler cap (with the engine off)?