It's acceptable to use 0W-20 engine oil in place of 5W-20 or even 10W-20, since the number preceding the W refers to its low-temperature viscosity. However, you should match the oil grade exactly ...

you should be using a full synthetic or synthetic blend 5W-20 oil. A 6.2-liter HEMI engine requires 0W-20 oil, which is a bit lighter when the engine is cold. Drivers of vehicles with 6.4-liter ...