Here's why:
* CC stands for cubic centimeters, which is a unit of volume.
* Liters are also a unit of volume, and 1 liter is equal to 1000 cubic centimeters.
* 1598 cc divided by 1000 equals 1.598 liters, which is rounded up to 1.6 liters.
So, a 1598 cc engine is often referred to as a 1.6-liter engine for simplicity.