Oil warning lights light up
This is the clearest sign that many drivers still deliberately ignore. When the oil lamp on the dashboard is lit up, it means that the oil pressure is decreasing or the oil is too dirty to effectively lubricate the engine.
The engine complains, the engine runs more noisy than usual
Old oil no longer ensures the necessary viscosity, causing more metal details in the engine to rub, causing loud noise. If you hear the strange sound of the engine hitting the line or mu mu, it may be time to change oil.
Oil color turns black, with residue
The new oil is often transparent amber, but after a period of use, it will turn black due to the accumulation of dirt and carbon waste from the fuel combustion process. Check the oil bar, if the oil is too dirty, it is time to replace.
Vehicles consume more fuel
Poor oil quality makes the engine work harder, leading to increased fuel consumption. If you notice gasoline levels falling faster than normal without a clear reason, think about checking the oil immediately.
The pungent smell comes from the engine compartment
Old oil, which is broken down by high temperatures can create a burning smell. This is a dangerous sign, showing that the oil no longer has the ability to protect the engine and can cause overheating.
Black or blue smoke discharge
If the chimney emits black or blue smoke, the oil may have burned in the incinerator due to leakage or because the oil was too old. Check and change the oil immediately to avoid serious damage.
