Kia Cerato 2009 Service Manual page 8

This measurement must be done in as short a time as possible.
Compression pressure :
2,157.45kPa (22.0kg/cm², 312.91psi) (200 rpm)
Minimum pressure :
1,863.25kPa (19kg/cm², 270.24psi)
Difference between each cylinder :
98.07kPa (1.0kg/cm², 14.22psi) or less
(5) If the cylinder compression in 1 or more cylinders is low, pour a small amount of engine oil into the
cylinder through the spark plug hole and repeat step 1) through 3) for cylinders with low compression.
A. If adding oil helps the compression, it is likely that the piston rings and/or cylinder bore are worn or
damaged.
B. If pressure stays low, a valve may be sticking or seating is improper, or there may be leakage past
the gasket.
4. Reinstall the injectors. (Refer to FL Gr.)