The duration for which engine oil stays clean depends on various factors, such as the type of oil used, the engine's condition, driving conditions, and maintenance practices. Generally, engine oil gradually becomes dirty and contaminated over time as it circulates through the engine. It picks up contaminants like dirt, metal particles, and combustion by-products.
In modern vehicles with conventional mineral or synthetic oils, it is recommended to change the oil and oil filter every 5,000 to 7,500 miles (8,000 to 12,000 kilometers) or every six months, whichever comes first. However, this interval may vary depending on the manufacturer's recommendations, driving conditions (such as frequent stop-and-go traffic or extreme temperatures), and the specific oil used.
It's important to note that many newer vehicles are equipped with oil life monitoring systems that analyze various factors, such as engine load, temperature, and driving patterns, to determine when an oil change is needed. These systems can provide more accurate intervals for oil changes based on individual driving habits.
Regular oil and filter changes are essential for maintaining engine performance and prolonging its lifespan. Fresh, clean oil helps lubricate the engine components effectively, reduces wear and friction, and helps remove harmful contaminants from the engine. Always consult your vehicle's owner's manual or the manufacturer's recommendations for the specific oil change intervals for your vehicle.