* Engine operating temperature: More frequent high-temperature operation shortens oil life.
* Engine RPM: Higher RPMs generally lead to faster oil degradation.
* Driving style: Frequent short trips, idling, and aggressive acceleration increase wear on the oil.
When the oil life monitor reaches a certain percentage (usually around 0% or a very low percentage), it's signaling that it's *estimated* that the oil has degraded to a point where it should be changed. This is just an estimate, not a precise measurement.
Therefore, you reset the oil life monitor *after* you've changed the oil and filter. The reset essentially tells the computer to start a fresh calculation of oil life based on your subsequent driving patterns. Failure to reset it will lead to a persistent low oil life warning.
Important Note: While the oil life monitor is a useful guideline, you should also adhere to the manufacturer's recommended oil change interval (usually found in your owner's manual), which is typically based on mileage or time. Severe driving conditions may require more frequent oil changes than what the monitor suggests. Don't rely solely on the monitor; consider its recommendation alongside the manufacturer's advice.
