It is also inconvenient to use the generator set at low loads as well as using it above the capacity specified in the label values. More attention should be paid to this situation, especially in the use of large power generator sets. Situations that may occur in generators used at low load are listed below:

• The engine required to operate at a lower temperature than the required operating temperature,
•  Lower cylinder pressure,
•  Excessive and rapid wear of the turbocharger, Oil leaks from the body of the turbocharger,
•  Insufficient combustion of the fuel due to the decrease in temperature and cylinder pressure in the combustion chamber, the increase in soot, and the accumulation of unburned fuel residues in the cylinders and pistons, causing abrasive friction,
•  Unburned fuel leaking from the piston rings and mixing with the oil, filling and clogging the injectors with soot, and accordingly the worsening of the combustion,
•  Dilution of the oil and the deterioration of its viscosity,
•  Increasing friction with oil whose quality and viscosity deteriorates, causing very rapid and very harmful wear and then breakage of pistons, rings, liners, connecting rods, bearings and crankcase bearings,
•  Running the generator at low load causes white smoke produced from the exhaust with high hydrocarbon emissions due to low temperature,
•  Due to the swelling or cracking of the cylinder head gaskets, hot water in the engine mixing with the oil and starting to emit blue or sometimes black smoke from the exhaust,
•  Clogging of valves and fuel pipes due to slag,
•  Excessive crankcase pressure,
•  Large accumulation of soot (slag) in the pistons, the grooves of the piston rings, the valves and the turbocharger,
• Locking of the pistons due to faulty lubrication when the engine running at low load for a long time starts to operate at full load,
• If the engine's power is high, the pistons starting to get stuck as it is strong, as well as the break of the rods, the bearings and then the pistons, the explosion of even the engine block,
•  Unconsumable fuel and lubricating oil also entering the exhaust manifold and starting to leak from the gaskets, possibly because it is diluted,
•  Low-load operation inevitably causing not only white smoke from unburned fuel, but also blue smoke from damaged piston rings from burnt lubricating oil over time, and black smoke from damaged injectors.
•  In summary, engines that work for a long time with low load cause a cycle of deterioration very quickly if necessary precautions are not taken and cause the engine to die with irreversible damages.