* Low Oil Level: This is the simplest and hopefully the problem. Check your oil level immediately using the dipstick. If it's low, add the correct type and amount of oil. However, if the pressure is already low, adding oil alone might not immediately solve the problem, as the damage might already be done.
* Worn or Damaged Oil Pump: The oil pump is responsible for circulating oil. A failing pump won't provide sufficient pressure. This is a major repair.
* Clogged Oil Pick-up Tube: The oil pick-up tube in the oil pan sucks oil up to the pump. If it's clogged with sludge or debris, the pump won't get enough oil.
* Blocked or Damaged Oil Filter: A clogged oil filter restricts oil flow, leading to low pressure. Replace it immediately.
* Worn Engine Bearings: Worn bearings allow oil to leak past them, reducing the amount available for pressure. This is a major and expensive repair.
* Leaking Oil Seals: Leaks in the oil seals reduce the amount of oil in the system, resulting in low pressure.
* Worn Piston Rings: Worn piston rings can allow oil to leak into the combustion chambers, reducing the oil in the system and leading to low pressure and potentially blue smoke from the exhaust.
* Damaged Oil Pressure Sending Unit: While this sensor might be faulty and giving a false low pressure reading, it's less likely to be the sole cause of actual low oil pressure. A bad sensor *indicates* a problem, but doesn't *cause* it.
* Excessive Oil Viscosity (Too Thick): Using oil that's too thick for the temperature can hinder oil flow. Check your owner's manual for the correct oil viscosity for your climate.
What to do immediately:
1. Check the oil level: If low, add oil *carefully*, checking frequently to avoid overfilling.
2. Check the oil filter: Replace it if it's old or looks damaged.
3. Do NOT drive the van until you have determined the cause of low oil pressure. Continuing to drive with low oil pressure will likely cause catastrophic engine damage.
Next steps:
If the oil level is good and the oil filter is new, you need professional help. A mechanic can diagnose the problem accurately and perform the necessary repairs. Ignoring low oil pressure can lead to a seized engine, which is a very expensive repair or even a total loss. The age of the van also means other components might be worn out.
