How to decide whether you should change to 0W-20 synthetic engine oil?

With more and more manufacturers specifying 0W-20 engine oil on new vehicles you’re also probably wondering whether you really need to change to 0W-20 synthetic engine oil.

After all why should you change to 0W-20 synthetic engine oil when your 2000 model year vehicle still uses a 5W-30 oil, while the exact same engine in your 2001?

Why it’s better to change to 0W-20 synthetic engine oil.