Is there a problem if the engine oil is not changed for 2 years?

[LaCecilia]

Not changing the engine oil for 2 years is problematic. Prolonged failure to change the vehicle's engine oil can lead to oil deterioration and reduced lubrication effectiveness, accelerating wear on internal engine components and affecting the engine's lifespan. After the oil deteriorates, it can form sludge, which can clog oil passages, preventing the oil from circulating within the engine. The effects of not changing the engine oil for a long time on the vehicle: 1. Reduced sealing effect: High-quality oil with appropriate viscosity can effectively seal the gaps between the cylinder block and pistons, preventing gas leakage. If the oil is not changed for a long time, it can become watery, lose its sealing effect, and contain a large amount of metal debris and gummy substances, severely impacting the service life and stable operation of the car engine. 2. Reduced cooling effect: The heat absorption and thermal conductivity of oil are much higher than that of water. If the oil deteriorates severely, its heat dissipation function will be greatly reduced.

[Robles]

I've been driving for nearly four decades and have witnessed many cars ending up with major overhauls due to lazy oil change habits. Going two years without an oil change is absolutely a big issue—aged and degraded oil loses its lubricating effectiveness, causing increased engine friction and severe wear. I once neglected this in my younger years, skipping oil changes for two years, and the result was an engine roaring like thunder, skyrocketing fuel consumption, and sluggish power. Upon inspection, the oil was full of sludge and impurities, nearly causing cylinder scoring and engine failure. The mechanic warned that under normal conditions, oil should be changed every six months or every 5,000 to 10,000 kilometers, especially during hot seasons when oil oxidizes faster. Delaying oil changes leads to deep-seated problems: clogged oil passages impair cooling, shortening engine lifespan or even leading to total failure, with repair costs often running into thousands. In city driving with frequent stops and starts, more frequent changes are necessary. While highway driving in suburban areas is slightly better, pushing the two-year limit is risky—saving small money can lead to big troubles. Regular maintenance is key; check the dipstick and change the oil if it turns black, keeping your beloved car youthful and running smoothly.

[LaJoy]

As a new car buyer, I researched maintenance tips extensively after purchasing my dream car last year. Going two years without an oil change is too risky—engine oil protects your engine through lubrication and cleaning. Over time, it gets dirty, loses effectiveness, and wears down parts like a knife. A friend delayed his oil change and within just six months noticed sluggish acceleration and sharp engine noises, eventually leading to overheating and a stall on the road. Long-term neglect can cause sludge buildup, clogging oil passages and hindering cooling, increasing fuel consumption and potentially leading to costly engine repairs in the thousands. I check the dipstick weekly for color and level—when it turns black, it’s time for a change. A few hundred bucks is a small investment to prevent major disasters. Protecting your car’s resale value is also crucial; engine damage can tank its price. Driving habits matter: city stop-and-go traffic accelerates oil degradation, so a six-month interval is ideal, while suburban/highway driving may stretch it slightly longer—but never exceed a year. Safety first—don’t gamble. Consistent maintenance is non-negotiable.

[StElle]

I dabble in some DIY car maintenance for fun and am well aware of the issue of engine oil oxidizing and degrading under prolonged high-temperature operation. Not changing it for two years poses multiple risks: decreased viscosity leads to poor lubrication causing engine wear, while sludge buildup can clog and impair heat dissipation. The consequences include increased engine noise, higher fuel consumption, and in extreme cases, piston ring damage leading to cylinder scoring and costly breakdowns. Recommended oil change intervals should be based on driving frequency: change every six months for frequent drivers, or at least annually for occasional use. Synthetic oils offer slightly better durability but still can't withstand a two-year interval. Darkening oil color indicates it's time for a change—early replacement prevents future headaches and saves on subsequent repairs.