If you don’t change your car’s oil regularly, several serious problems can develop over time. Here’s what can happen:
- Oil Breaks Down
Oil loses its viscosity and ability to lubricate properly. It becomes thick, dirty, and less effective at reducing friction between engine components.
- Engine Wear and Tear
Without proper lubrication, engine parts rub against each other with more friction, causing accelerated wear. This can lead to:
- Overheating
- Warped parts
- Increased metal shavings in the oil
- Sludge Buildup
Old oil can turn into sludge, which clogs passages in the engine. This restricts oil flow and can suffocate the engine internally.
- Poor Performance and Efficiency
You might notice:
- Reduced gas mileage
- Sluggish acceleration
- Rough idling
- Engine Overheating
Oil also helps regulate engine temperature. Without fresh oil, overheating is more likely, which can warp or crack engine parts.
- Complete Engine Failure
Neglecting oil changes long enough can lead to the engine seizing up entirely — often a death sentence for the engine, requiring a full rebuild or replacement.
Bottom line: Changing your oil regularly is one of the cheapest ways to protect one of the most expensive parts of your car. Stick to the manufacturer’s recommended schedule (often every 5,000–7,500 miles, depending on the car and oil type).