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You know the drill. After an oil change, you're given the mileage and/or recommended timeline to get your next one. The expectation is that you'll go for your vehicle's next oil change at whichever one comes first. If you don't drive often, you'll likely hit the time interval before the mileage one. On the other hand, if you drive frequently, you'll probably hit the mileage interval before the time interval.

But sometimes you might find yourself wondering: are they both truly equal in importance?

If you choose a high performing synthetic oil that lasts more miles than other brands and types, for example, but you end up not driving your vehicle as much as you thought you would, do you still need to replace the oil at the time interval? Is it possible to wait until the mileage interval instead? After all, your vehicle was sitting. How bad can the oil be?

Why Do Time & Mileage Oil Change Intervals Exist?

Like most automotive parts and fluids, the quality of your engine oil can change from use and time. This is why time and mileage are both important factors to consider.

Here's a breakdown of each factor:

1. Time: Over time, engine oil breaks down from exposure to heat, contaminants, and oxidation. Even if a vehicle isn't driven much, the oil's effectiveness can diminish. Time-based oil change intervals are particularly important for vehicles that undergo infrequent use or short trips where the engine doesn't reach its optimal operating temperature. Condensation tends to form in stop-and-go environments (city driving, for example). You also want to watch for condensation when it comes to low mileage. If you live in a humid environment or don't drive long enough to evaporate condensation that forms (such as driving in a "stop-and-go" environment like a city), it can take a toll on your oil even if you don't drive your vehicle often.

2. Mileage: The distance you drive is a key factor in determining when to change your oil. Engine oil accumulates contaminants and particles as it circulates through the engine. Higher mileage means more wear and tear, leading to the buildup of these contaminants. Mileage-based oil change intervals are suitable for vehicles that are regularly driven and used for longer trips.

To strike the right balance between time and mileage, it's important to consider the manufacturer's recommendations found in your vehicle's owner's manual and the oil manufacturer's guidelines for the type of motor oil you use. One other item to keep in mind is the age and condition of your vehicle. If you drive an older vehicle or car with a history of mechanical issues, it might be beneficial to change your oil more frequently than recommended to maintain engine health.

Ultimately, time is just as valid a reason to change your oil as mileage. Changing your oil on time is also always the better option than taking a chance and ending up with a less lubricated and less fuel efficient vehicle that runs into issues in the future.

If in doubt, consult your owner's manual or speak to a qualified mechanic at King's Grant Exxon in Virginia Beach for personalized advice based on your specific driving habits, last oil change, type of oil, and vehicle make/model.