每个驾驶员都知道定期换油的重要性。通常，机油stay stable and have a shelf life of up to five years. However, this stability can depend on a number of factors and it is always advisable to follow the manufacturer’s贮存instructions. You must also keep a watch on the expiry date and refrain from using the motor oil once it has crossed that date. There are different types of motor oils available in the market such as synthetic motor oil, synthetic blend motor oil, high-mileage motor oil, and conventional motor oil. Their composition and the additives in them will affect their stability and storage capacity.

机油成分

决定机油保质期的主要因素是其成分。合成机油来自石油和非石油化合物。合成机油中的碳氢化合物分子均匀地通过它散布。这形成了在非常高和非常低的温度下保持稳定的基础或碱。它不包含污染物，例如石油蜡，这是原油的组成部分，也有助于更长的保质期。

添加剂决定保质期

Mobil 1和其他石油制造商在其石油产品中添加了几种化合物，以便最好保护您的发动机并持续更长的时间。这些添加剂ensure that the synthetic motor oil maintains its viscosity or consistency. In other words, it must freely flow at all temperatures within the required test standards.

• 如果机油包含诸如铜和铁等元素，则可能会导致其较低的保质期，因为这些元素充当催化剂并加快氧化加速。

• To stop the motor oil from freezing at low temperatures, manufacturers add pour point depressants, or PPDs. PPDs are a kind of polymer that works to inhibit the forming of wax crystals so that the motor oil flows freely.

• 机油中的洗涤剂和分散剂延迟了污泥的形成，并通过将污染物悬挂在油中来帮助保持油的清洁。

• 散象保护机油免受泡沫和形成气泡的影响。

• 大多数机油含有碱性添加剂，可中和酸性污染物。

• 氧化抑制剂有助于保持机油的稳定性，而生锈和腐蚀抑制剂则阻止了凝结。

• 钙添加剂确保油收到所需的氧气。他们还有助于延迟污泥和清漆。

Other factors dictating shelf life

• 建议以40度至85度华氏度的恒定最佳温度以恒定的最佳温度存储。极端温度（例如低于0ºF或100ºF）会影响机油有效润滑发动机的稳定性和能力。非常低的温度会导致机油中的沉积物形成。

• Storing the motor oil in a dusty environment can result in deterioration of its quality.

• 暴露于湿度会导致机油中的凝结。这种水分可以与机油中的添加剂反应并形成不溶性颗粒。污泥也可以形成，机油可以变成微生物的繁殖地。

• If the bottle of motor oil remains unopened, it stays stable for a longer time.

识别稳定的可用机油的迹象

If you have stored the motor oil in a cool, dark place and it has not passed the expiry date, you could use it. However, you must check it carefully for its consistency. If it is thick and sticky, and has solid or gel-like particles, do not use it. If you see that the additives seem to have separated from the oil, it is not safe to use. You must also check its color. Usable motor oils have a clear appearance and if you notice any milkiness or haziness, that is a sign of water contamination. A change in the original color of the motor oil could also indicate its instability.

Keep in mind

• 尽管仔细地打开或未打开的瓶子，但存储区域温度的变化可能会导致空气进出瓶子。如果其中有空置空间，则尤其如此。在高温下，空军从容器中和低温下，将空气拉入其中。这可能导致运动油随时间变化。

• 如果您最近购买了新车或任何其他车辆，请检查您拥有的机油是否与新车辆的发动机兼容。制造商一直升级发动机，您的旧机油可能无法满足新的标准和要求。使用错误的油可能会损坏发动机。

• Regulations pertaining to the motor oil being used in cars can also change over time. Make sure your motor oil is compliant with them before using it.

MOBIL 1生产一系列常规和合成油，包括Mobil 1 Classic，Mobil 1高级全合成机油和Mobil 1高里程。万博体育入口您的机电为每种移动机油变化带来了高质量的Mobil 1油。