Each engine is tested for proper performance and leaks before being installed into a vehicle. The conventional test method is
the hot test, in which the engines run with their own power until a specified engine oil temperature has been reached. This
warm up procedure is performed either without applying load to the engine or with load, while all critical engine data are measured, monitored and documented, such as

• Rpm and torque
• Oil pressure and oil temperature
• Coolant temperature and coolant flow
• Constant Rpm, ignition, injection, timing, blow by, exhaust gas emission, etc.

Upon completion of the warm up phase, a short performance test may be performed. Then the operator checks the engine for abnormal noises and leaks.