1999 Suzuki Esteem - engine oil for a G13B engine

Which engine oil can be used in g13b engine?

The answer is in the owners manual. Sometimes on the oil cap itself. Just a guess either 5w-30, or 10w-30.

It is your vehicle so you can use anything you want. But a simple web search shows 5W30 and it only took less than a minute to find that .

5W30 or 10W30. https://www.engine-specs.net/suzuki/g16b.html