What will happen if the engine oil is not changed for a long time?
Engine oil is the "blood" of the engine, and regular replacement is the key to ensuring the healthy operation of the vehicle. However, many car owners extend the oil change interval due to negligence or cost-saving, resulting in increased potential risks to the engine. This article will combine the hot topics and hot content on the Internet in the past 10 days to analyze the dangers of not changing the engine oil beyond the due date, and provide structured data for reference.
1. Five major hazards of not changing engine oil beyond the due date
1.Decreased lubrication performance: After long-term use of engine oil, the viscosity decreases and the oil film cannot be effectively formed, resulting in increased wear of engine parts.
2.Carbon and sludge accumulation: Impurities and oxidation products accumulate in old engine oil, clogging the oil circuit and affecting heat dissipation and lubrication effects.
3.Engine overheating: The heat dissipation ability of engine oil is weakened after aging, which may cause the engine temperature to rise abnormally and even cause cylinder explosion.
4.Increased fuel consumption: Frictional resistance increases, engine efficiency decreases, and fuel economy decreases.
5.Emissions exceeding standards: Deteriorated engine oil cannot effectively clean the combustion chamber, and the content of harmful substances in the exhaust gas increases.
2. Reference data of engine oil replacement cycle
| Oil type | Recommended replacement cycle (km/month) | Shortening ratio under extreme conditions |
|---|---|---|
| mineral oil | 5000/6 | 30% |
| Semi-synthetic oil | 7500/8 | 25% |
| Fully synthetic oil | 10000/12 | 20% |
Note: Extreme conditions include frequent short-distance driving, high temperature/cold environments, heavy cargo loading, etc.
3. Performance comparison experimental data of expired engine oil
| Length of use | Viscosity drop rate | acid value increase rate | Impurity content (mg/kg) |
|---|---|---|---|
| within the standard period | 8-12% | 15-20% | 200-300 |
| 50% overdue | 25-30% | 40-50% | 600-800 |
| 100% overdue | 40-45% | 80-100% | 1200-1500 |
4. Analysis of common misunderstandings among car owners
1."If the engine oil turns black, change it": Modern engine oil contains cleaning and dispersing agents. Blackening is a normal phenomenon and needs to be judged based on mileage and time.
2."High-grade engine oil can extend the cycle": Although fully synthetic oil has superior performance, it still needs to comply with the manufacturer's recommended cycle.
3."It is more economical to repair without replacing": Replenishing new engine oil cannot replace a complete replacement, as impurities will continue to accumulate.
5. Professional advice
1. Check the engine oil dipstick regularly to observe the oil level and texture.
2. Engine oil suitable for temperature characteristics can be selected in different seasons.
3. When changing the engine oil, replace the engine filter simultaneously to ensure the filtering effect.
4. Keeping maintenance records will help preserve the value of used cars.
Conclusion:Properly changing engine oil is one of the most cost-effective ways to maintain a car. According to the latest survey data, car owners who change oil on time reduce the probability of engine overhaul by 67% and save more than 40% in average annual maintenance costs. Develop good maintenance habits to keep your car in top condition.
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