What type of oil does a 1998 2 ltr hyunday coupe need?

What type of oil does a 1998 2 ltr hyunday coupe need?
I'm going to guess you meant Hyundai.

If you look on the core support in the engine (above the radiator, and usually around roughly where the hood latches) there should be a sticker with the manufacturer recommended oil.

The answer is non-specific because there are other factors including what oil historically has been used, and the operating temperature of the car. W30, 5W30, or 10W30 are the likely suspects. In cold climates you would use W30 or 5W30 (never ever goes over 100 degrees), in hot climates (it COULD go over 100 degrees but won't go below 40 degrees) you would use 10W30.

If you use 10W30 in a very cold climate you could have hard starting and poor economy. If you use thin oil in a hot climate it can start to cook and lose viscosity (it's lubricating effect) leading to premature engine wear.