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.

The second number is its viscosity at 100 degrees Celsius (212 degrees Fahrenheit). Thus, with a 0W-30 oil, it will act as a 30-grade oil at hot or normal operating temperatures.

Most engine oils have different numbers on their labels. Here is what those numbers mean and if you can use 0W-20 in place of 5W-30.