* Bearing damage: This is the most serious potential consequence. The engine's bearings (crankshaft, connecting rod, camshaft) rely on a constant supply of oil for lubrication. Running low on oil leads to metal-on-metal contact, scoring, and ultimately, failure of these bearings. This can lead to a catastrophic engine failure requiring a rebuild or replacement.
* Seized engine: In the worst-case scenario, the bearings could seize completely, locking up the engine and rendering it immobile.
* Cylinder scoring: Lack of lubrication can also damage the cylinder walls, leading to reduced compression and power loss.
* Damaged oil pump: The oil pump might have been damaged trying to pump insufficient oil.
* Other internal damage: Various other internal components may have suffered damage due to friction and heat generated from lack of lubrication.
* Timing chain/belt damage: Depending on the engine design, insufficient oil might impact lubrication to the timing chain or belt, potentially causing it to break and lead to valve damage.
What you should do:
1. DO NOT start the car. Driving it further will almost certainly worsen the damage.
2. Have it towed to a reputable mechanic: They can assess the extent of the damage.
3. Provide documentation: Keep the oil change receipt showing the service was performed, this is crucial in any potential legal action.
The engine light came on due to low oil pressure, confirming the severity of the situation. The cost of repair could range from relatively inexpensive (if only minor damage occurred, like a simple replacement of the engine parts affected) to extremely expensive (requiring engine rebuild or replacement). The sooner you have it assessed, the better the chances of limiting the extent of the damage and its associated costs. You likely have grounds to pursue compensation from the oil change dealer for their negligence.
