Based on expert advice, semi-synthetic oil typically lasts between 3,500 to 5,000 miles or four-to-six months, whichever comes first.
Understanding when to change your semi-synthetic oil is crucial for maintaining your engine's health and performance. Unlike a fixed date or mileage, the duration semi-synthetic oil is effective depends on two key factors: mileage driven and the time elapsed since the last change.
According to expert Ruhl, as quoted in the reference:
“All conventional is semisynthetic anyway, but a lot of people don't recognize that,” Ruhl said. “So, on a semisynthetic, you should change the oil between 3,500 to 5,000 miles, or every four-to-six months, whichever comes first.”
This means you should monitor both your odometer and the date of your last oil change.
Key Change Intervals for Semi-Synthetic Oil
Here's a simple breakdown of the recommended intervals based on the reference:
| Factor | Recommended Interval |
|---|---|
| Mileage | 3,500 to 5,000 miles |
| Time | 4 to 6 months |
You should change your oil when you hit either the mileage limit or the time limit, whichever occurs first.
- If you drive 4,000 miles in three months, you should change the oil based on mileage.
- If you only drive 1,000 miles in five months, you should change the oil based on time.
Adhering to these intervals helps ensure your engine is properly lubricated and protected against wear and tear.
