Proton eMas 5 uses 1.5 litre four-cylinder i-GT engine. What matters in daily ownership is how that engine character supports normal driving: smooth starts, relaxed cruising and enough response when the car is loaded with passengers. An engine like this is best understood by how easily it handles city traffic and highway overtaking, not just by its displacement. For most buyers, the right test is whether it feels calm and consistent during a weekday commute and a long weekend drive.