Does Oil Go Bad Sitting in a Car?
Does Engine Oil Deteriorate Over Time?
Yes, engine oil can go bad even if a car is not being driven. While oil is designed to lubricate and protect the engine, it degrades over time due to various factors like oxidation, moisture buildup, and contamination.
How Long Does Oil Last in a Sitting Car?
✔ Conventional Oil – Typically lasts 6 to 12 months before breaking down.
✔ Synthetic Oil – Can last 12 to 24 months, but still degrades over time.
Even if the car isn’t being used, oil can still lose its effectiveness, leading to poor lubrication and potential engine damage.
What Causes Oil to Go Bad in a Parked Car?
✔ Oxidation – Exposure to oxygen causes oil molecules to break down, reducing effectiveness.
✔ Moisture Buildup – Condensation inside the engine can mix with oil, leading to sludge.
✔ Temperature Changes – Extreme hot or cold conditions can degrade oil faster.
✔ Contaminants – Dirt, dust, and fuel residues can mix with oil, reducing its protective properties.
How to Tell If Oil Has Gone Bad
✔ Dark and Sludgy Appearance – Oil should be smooth and amber-colored.
✔ Strange Odor – A burnt smell indicates oil degradation.
✔ Check Engine Light – Old oil may trigger engine warnings.
Should You Change Oil in a Car That Has Been Sitting?
Yes! Even if you haven’t driven much, it’s best to follow the time-based oil change interval recommended in your car’s manual.
Conclusion
Even if a car isn’t being driven, engine oil degrades over time due to oxidation, moisture, and temperature changes. To prevent engine damage, it’s recommended to change the oil at least once a year, even if the mileage is low.
Also Check:
• Does Motor Oil Go Bad Over Time?
