Is There a Problem If a Car Hasn't Had Its Oil Changed for a Year and a Half?
3 Answers
It is problematic if a car hasn't had its oil changed for a year and a half, as the oil will deteriorate and lose effectiveness, providing no protection to the engine. The functions of engine oil: Engine oil lubricates and reduces friction, aids in cooling, seals against leaks, prevents rust and corrosion, and acts as a shock absorber for the engine. Regular oil changes are essential: Depending on the type of oil, fully synthetic oil typically needs to be changed every 10,000 kilometers, semi-synthetic oil every 7,500 kilometers, and mineral oil every 5,000 kilometers. Even if the mileage hasn't been reached, the oil must be changed after one year because, even if unused inside the engine, oil loses most of its functionality after a year.
As an average car owner, I have to say that not changing the oil for a year and a half is absolutely problematic. Engine oil isn’t static—it degrades over time, thickens, and accumulates impurities, forming sludge. This significantly increases internal engine friction and wear. Oil should typically be changed every 6 months or around 5,000 miles because it’s responsible for lubricating, cooling, and cleaning engine components. Prolonged use can lead to higher temperatures and accelerated damage to metal parts like piston rings and cylinder walls, potentially causing engine seizure or complete failure. Check the dipstick immediately—if the oil appears black and overly viscous, stop driving and tow the car to a repair shop for a full oil and filter change. Keeping a maintenance calendar can save you a lot of trouble in the long run.
From my experience, safe driving is more important than anything else. Not changing the engine oil for a long time does pose risks. Aged oil loses its lubricating effectiveness, which can cause the engine to overheat or even seize. If the engine suddenly stalls on the highway, it could affect the brake booster system and lead to a serious accident. Engine oil should be replaced every six months to ensure proper functioning of the components. You can also regularly check the oil level and condition yourself. If any abnormalities are found, addressing them promptly can prevent risks. Don’t take unnecessary risks to save a small amount of money. Proper maintenance ensures your car reliably protects you and your family.
