List some advantages of internal combustion engines?

There are a number of advantages of internal combustion engines. Some are mentioned below:

1. In comparison with an external combustion engine, the size of this engine is very less.
2. These engines have a high power to weight ratio.
3. This engine is good for applications which require small power.
4. As compared to the external combustion engine, these engines are more portable.
5. Internal combustion engines are very safe to operate.
6. It does not take much time to start.
7. Usually, these engines have higher efficiency than their counterpart external combustion engine.
8. There is no chance of fluid to leak in an internal combustion engine.
9. Internal combustion engines require less maintenance.
10. It does not consume lubricant as much as an external combustion engine