An oil change swaps the used oil in your engine for fresh oil and, in most cases, replaces the oil filter at the same time. It is one of the most routine maintenance jobs on a car, and one of the most important for keeping the engine in good shape. This guide covers what the service does, what happens during it, and how long it usually takes.
What an oil change does
Engine oil does several jobs at once:
- Lubricates. It forms a thin film between moving metal parts so they do not rub directly against each other.
- Helps cool the engine. Oil carries some heat away from hot areas such as the pistons and bearings.
- Helps keep the engine clean. Oil picks up dirt, tiny metal particles, and combustion byproducts and carries them to the filter.
- Protects against wear and corrosion. Additives in the oil help with this, and they gradually get used up.
Over time oil collects contaminants and its additives wear out, so it protects less effectively. Changing it restores fresh oil with its additives intact, and a new filter removes the debris the old one has collected.
What happens during an oil change
The exact steps vary by car and shop, but a typical service looks like this:
- The vehicle is raised or placed over a pit so the technician can reach the underside.
- The drain plug is removed and the old oil drains out of the oil pan.
- The old oil filter is removed and a new one is installed.
- The drain plug is replaced and fresh oil is added through the filler opening, in the amount and grade your car calls for.
- The oil level is checked, and the technician usually looks for leaks.
- The oil life reminder, if your car has one, is reset.
The correct oil grade and quantity are listed in your owner’s manual. If you are unsure which type to choose, see our comparison of synthetic vs. conventional oil.
Will your car drive better afterward?
You may not notice a big difference if your oil was changed on schedule. If the oil was well overdue, the engine may run a bit more smoothly or quietly with fresh oil. The main benefit is long-term protection rather than an instant change in how the car feels. Keeping up with changes is generally associated with less engine wear and fewer problems down the road.
How long does an oil change take?
Times vary a lot depending on where you go and what else is done. As a rough guide:
| Where | Typical time |
|---|---|
| Quick lube shop | Often around 10 to 30 minutes, sometimes without an appointment |
| Dealership or full-service repair shop | Often 30 to 60 minutes or more, especially with an inspection |
| Doing it yourself | Often 30 to 60 minutes, plus time for cleanup and taking the used oil to a recycling location |
These are rough ranges, not guarantees. Things that can add time include:
- Busy periods. Weekends and lunch hours can mean a wait.
- Extra services. A tire rotation, air filter replacement, or multi-point inspection adds time.
- Your vehicle. Some trucks, SUVs, diesels, and cars with underbody covers take longer than a typical sedan.
- Appointments. A booked slot at a dealer or independent shop can shorten the wait.
Do you stay in the car during an oil change?
At many quick lube shops you can stay in the car, though policies differ. At dealerships and repair shops you will usually wait in a lobby while the car is serviced. Ask when you arrive if you are unsure.
What skipping oil changes can lead to
Old oil that is never replaced can thicken, turn sludgy, and lose its ability to protect. That can mean more engine wear, reduced efficiency, and in serious cases engine damage that is expensive to repair. Overheating is one way this shows up; see engine oil overheating. If you are not sure whether yours is due, check the signs you need an oil change.
Choosing an oil type and interval
- How often you need a change depends on your vehicle, oil type, and driving. See how often to change your oil, including for full synthetic.
- Oil changes are one part of a full car maintenance schedule. The filter is replaced at most oil changes. Learn more about the oil filter change interval.
- Fully electric cars do not use engine oil. See whether electric cars need oil changes, including how hybrids differ.
Quick summary
- An oil change replaces used oil and usually the filter.
- Fresh oil lubricates, helps cool, and helps keep the engine clean.
- Expect roughly 10 to 60 minutes depending on the shop and extra services.
- Follow your owner’s manual for oil type and timing.