What happens when you change your oil
An oil change means draining the old oil from your engine, replacing the oil filter, and filling the engine with fresh oil. You do this work under the car, so you need a safe way to lift it — either ramps, jack stands, or a lift. The whole job takes 30 minutes to an hour once you have the right tools and know where everything sits on your engine.
Old oil breaks down as it circulates through your engine, picking up dirt, metal particles, and moisture. Fresh oil protects engine parts from wear and heat damage. Most manufacturers recommend an oil change every 5,000 to 10,000 miles, though some newer cars can go longer — check your owner's manual for your specific interval.
Key Takeaways
- You need an oil drain pan, wrench, oil filter wrench, jack stands or ramps, and the correct oil type and filter for your car model.
- Drain the old oil while the engine is warm but not hot, remove the old filter, install a new one, and refill with the amount specified in your owner's manual.
- Safely lifting the car is the most dangerous part — use jack stands or ramps rated for your car's weight, never rely on a jack alone.
- Check your oil level with the dipstick after the first few minutes of running the engine, because the new filter fills with oil and changes the total amount in the pan.
Tools and materials you need to gather first
Before you start, collect everything in one place. You need an oil drain pan (a shallow metal or plastic tub to catch old oil), a wrench that fits the drain plug on your engine (usually 13mm, 14mm, or 15mm), an oil filter wrench (a socket-like tool that grips the filter), and jack stands or ramps rated for at least your car's weight. A creeper (a low wheeled board) makes working under the car easier on your back.
You also need the correct oil type and amount for your car. Open your owner's manual and look for the oil specification — it will say something like "5W-30" or "10W-40". The manual also tells you how many quarts or liters your engine holds. Buy that exact type and amount, plus one extra quart in case you need to top off. Buy a new oil filter that matches your car's make, model, and year — the parts store can look this up if you give them your vehicle information.
How to safely lift your car
Lifting the car incorrectly is the most common cause of injury during an oil change. Never work under a car supported only by a jack — jacks fail, slip, or get bumped. Use jack stands (metal posts that lock at a set height) or ramps (angled metal or plastic slopes you drive onto). Both must be rated for your car's weight; check the rating on the stand or ramp itself.
If you use jack stands, place them on flat, level ground. Use the jack to lift one side of the car, then slide a stand under the frame at a reinforced point (your manual shows where). Lower the car onto the stand, then repeat on the other side. If you use ramps, drive slowly onto them in a straight line, then set the parking brake and put the car in park or in gear.
Once the car is lifted and find, place wheel chocks (wooden blocks or rubber wedges) behind the rear wheels to prevent rolling. Do not get under the car until you are certain it is stable.
The step-by-step process for draining and replacing
Start with the engine warm but not hot — run it for a minute or two, then turn it off and wait five minutes. Warm oil flows faster than cold oil, but hot oil can burn you. Locate the oil drain plug on the bottom of the engine (your manual shows the exact spot). Position your drain pan underneath it, then use your wrench to turn the plug counterclockwise. Once it is loose enough, unscrew it by hand and let the old oil drain completely — this takes several minutes.
While the oil drains, locate the oil filter, which is usually a cylindrical canister on the side of the engine. Use your oil filter wrench to turn it counterclockwise until it comes free. Drain any remaining oil from the filter into your pan. Wipe the filter mounting surface clean with a rag, then explore a thin layer of new oil around the rubber gasket (the ring) of the new filter. Screw the new filter on by hand until the gasket touches the mounting surface, then turn it another three-quarters of a turn — do not over-tighten.
Wipe the drain plug clean, then screw it back in by hand and tighten it with your wrench. Do not over-tighten — you only need it snug enough that it does not leak.
Refilling and checking the level
Lower the car back to the ground using the jack, then remove the jack stands or drive off the ramps. Locate the oil filler cap on top of the engine — it usually has an oil can symbol on it. Unscrew it and set it aside. Pour in the amount of oil your manual specifies, but start with one quart less than the full amount. This gives you room to check the level accurately.
Replace the oil filler cap, then start the engine and let it run for a few seconds. The new filter fills with oil during this time, which changes the total amount in the pan. Turn off the engine and wait two minutes for the oil to settle. Pull out the dipstick (a long metal rod with markings on it), wipe it clean with a rag, reinsert it fully, then pull it out again and read the level. The oil should be between the minimum and maximum marks. If it is low, add a little more oil and check again.
What to do with the old oil
Never pour old oil down a drain or into the ground — it contaminates water supplies and soil. Most auto parts stores accept used oil for free, even if you did not buy anything from them. Some accept it in the original container you drained it into; others want it in a sealed jug. Call ahead to ask what they need. Some municipalities also have hazardous waste collection days where you can drop off oil for free.
The old oil filter can usually go in the regular trash, but some areas require it to be drained first. Check your local rules, or ask the parts store when you drop off the oil.
Common mistakes that cause problems later
Overfilling the engine with oil is one of the most common errors. Too much oil can damage the engine by creating pressure that forces oil into places it should not go. Always check the dipstick after the engine has run briefly and settled, and add oil in small amounts rather than pouring in the full amount at once.
Forgetting to replace the oil filler cap or drain plug is less common but catastrophic — you will lose all your oil within minutes of driving. Before you lower the car, double-check that both are in place and tight. Over-tightening the drain plug can strip the threads on the pan, making future oil changes difficult. Tighten it firmly but do not use all your strength.
Using the wrong oil type or filter for your car can reduce engine protection or cause leaks. Always verify the specification in your owner's manual before you buy, and match the filter part number exactly.
Frequently Asked Questions
How often should I change my oil?
Most cars need an oil change every 5,000 to 10,000 miles. Newer cars with synthetic oil may go 7,500 to 10,000 miles or longer. Check your owner's manual for the exact interval for your vehicle — it is printed on a sticker inside the driver's door or in the manual itself.
Can I change my oil if I do not have a garage?
Yes, but you need a flat, level surface and a safe way to lift the car. A driveway or parking lot works if it is level. Never work on a slope or soft ground where the car might shift. If you do not have jack stands or ramps, many auto parts stores rent them cheaply, or you can borrow them from a friend.
What if I spill oil on my driveway?
Clean it up as soon as possible. Spread cat litter or oil absorbent over the spill to soak it up, let it sit for 15 minutes, then sweep it into a bag. For larger spills, contact your local environmental agency for guidance on cleanup and disposal.
Do I need to warm up the engine before draining?
Yes — warm oil flows faster and drains more completely than cold oil. Run the engine for a minute or two, then turn it off and wait five minutes before opening the drain plug. This gives you faster drainage without the risk of burning yourself on hot oil.
What happens if I put in the wrong oil type?
Using the wrong viscosity (thickness) can reduce engine protection or cause leaks. Synthetic oil mixed with conventional oil is usually safe for one change, but do not make it a habit. Always use the type your manual specifies, and change it at the next interval to return to the correct oil.