Is it okay to not change the engine oil for 2 years?
2 Answers
Not changing the engine oil for 2 years is problematic. Prolonged failure to replace the engine oil can lead to oil deterioration and reduced lubrication effectiveness, accelerating wear and tear on internal engine components and affecting the engine's lifespan. Deteriorated oil can form sludge, which may clog oil passages, preventing the oil from circulating within the engine. The impacts of not changing the engine oil for an extended period include: 1. Reduced sealing effectiveness: 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 function, and contain a large amount of metal debris and gummy deposits, severely affecting the engine's lifespan and stable operation. 2. Diminished cooling effect: Oil has much higher heat absorption and thermal conductivity than water. If the oil deteriorates significantly, its cooling function can be greatly reduced.
As someone who frequently deals with engines, I've seen many cases where car owners neglect oil changes, leading to serious problems. For example, a friend of mine didn't change the oil for two years, causing it to thicken and lose its lubricating properties. This resulted in increased internal engine wear, stuck piston rings, and ultimately a costly overhaul that cost over ten thousand yuan. The primary functions of engine oil are to reduce friction, cool components, and clean impurities. If not changed regularly, the additives in the oil degrade, and accumulated impurities lead to sludge buildup, clogging oil passages and causing engine overheating or even cylinder scoring. Don't underestimate this issue—it also reduces fuel efficiency and increases emissions. I recommend changing the oil every 5,000 to 10,000 kilometers or at least every six months, adjusting based on driving habits to avoid major losses over minor savings.
