1. Fuel Quality is Paramount
Diesel fuel, due to its non-flammable nature, is relatively safe, but its quality is crucial to the engine. Water or mechanical impurities in diesel fuel can severely damage the delicate fuel injection system (especially the high-pressure fuel pump and injectors).
Therefore, always choose reputable gas stations and always obtain and retain receipts after refueling for future reference. It is especially important to avoid accidentally filling a diesel vehicle with gasoline. If this happens, do not start the vehicle; immediately contact a professional mechanic to minimize damage.
2. Don’t Neglect Filter Maintenance
Diesel engines are renowned for their remarkable durability and long lifespan, thanks to their relatively low operating speed and simple structure. However, they also require rigorous maintenance, especially the “three filters”—diesel filter, oil filter, and air filter. These act as guardians of the vehicle, filtering impurities from the fuel, engine oil, and intake air, respectively.
Regularly checking and replacing these three filters is fundamental to ensuring strong engine power and reducing wear. Meanwhile, diesel engines require the use of special engine oil, and their replacement cycle should be determined based on the sulfur content of the local diesel fuel. Scientific maintenance is essential to maximize engine performance.
3. Never Drain the Fuel Tank Completely Before Refueling
Diesel engines are favored for their powerful torque and excellent fuel economy. However, it is crucial to avoid completely draining the fuel tank until the vehicle stalls. This allows air to enter the fuel system, causing the engine to fail to start or run unstably.
Before restarting, the fuel system needs to be bled, which is not only troublesome but can also damage some components due to dry friction. Develop the habit of frequently checking the fuel system and refueling early to ensure the fuel system is always adequately lubricated and cooled.
4. Utilize the Heat Pipe Indicator Effectively
To address the characteristic that diesel fuel is not easily ignited at low temperatures, most modern diesel trucks are equipped with a heat pipe system (usually indicated by a spiral-shaped indicator light). When the ambient temperature is low, turn the key to the “ON” position before starting the engine. This light will illuminate, indicating that the glow plugs are heating the air in the cylinders.
Wait for the indicator light to go out before starting the engine. This effectively protects the battery and starter motor and improves the success rate of cold starts. If this light suddenly flashes while the vehicle is in motion, it indicates a malfunction in the engine’s electronic control system and should be checked as soon as possible.
5. Don’t shut off the engine abruptly after a high load.
After long-distance travel or prolonged high-load operation, components such as the engine turbocharger will reach extremely high temperatures. If the engine is shut off immediately, the oil pump will stop working, while the turbocharger rotor will continue to rotate at high speed due to inertia. Lack of lubrication and cooling can easily damage its bearings.
The correct approach is to let the engine continue to run at total speed for 2 to 3 minutes to allow the circulating oil to help the core components cool down sufficiently before shutting off the engine. This simple habit greatly protects the turbocharger and extends its service life.
