1. Worn Engine Bearings:
- With time and mileage, the engine bearings can wear out, leading to increased clearances between the bearing surfaces.
- As the engine heats up, the oil becomes thinner and leaks out through these increased gaps resulting in low oil pressure.
2. Faulty Oil Pressure Sensor:
- The oil pressure sensor might be malfunctioning, giving false readings.
- A faulty sensor may display incorrect oil pressure readings, even though the actual pressure within the engine is within the normal range.
3. Oil Pump Issues:
- The oil pump might be failing or have worn out components, leading to inadequate oil circulation.
- A weak or damaged oil pump can't generate sufficient pressure to maintain a consistent flow of oil throughout the engine.
4. Clogged Oil Filter:
- A clogged oil filter can restrict oil flow and cause a drop in oil pressure.
- When the filter becomes blocked with dirt, debris, or contaminants, it can obstruct the oil's flow, leading to low pressure.
5. Oil Viscosity:
- The viscosity (thickness) of your engine oil can also be a factor in oil pressure.
- If you're using oil that's too thin, it may become too fluid when the engine is hot and can't maintain adequate pressure.
6. Excessive Engine Wear:
- General engine wear, such as worn-out piston rings, can lead to reduced cylinder compression.
- This can lower oil pressure because some oil pressure is generated by the compression process.
7. Oil Leaks:
- If the van has an oil leak, as the oil temperature increases, the oil can become thinner, making the leak more significant and causing a gradual decrease in oil pressure.
8.Faulty Oil Pressure Relief Valve:
- The oil pressure relief valve is designed to open and release excess oil pressure.
- If the relief valve malfunctions and stays open or opens at a lower pressure than it's supposed to, it can lead to a drop in oil pressure.
It's important to diagnose and address the underlying cause of the dropping oil pressure to ensure the engine is adequately lubricated and protected. If the issue persists, it's best to consult a qualified mechanic for further examination and repairs.
