You can change your own oil if you have the right tools, know your vehicle's specifications, and are comfortable working under a car — but the job involves hot fluid, tight spaces, and consequences if done wrong.
A DIY oil change costs less than a shop visit because you pay only for oil and a filter, not labor. The work itself takes 30 minutes to an hour once you know the process. But you need to safely lift the car, drain old oil without spilling it, locate and remove the filter, install a new one correctly, and refill with the exact oil type your engine requires. If any step goes wrong — you cross-thread the drain plug, overfill the crankcase, or forget to tighten the filter — you can damage the engine or create a leak that costs far more to repair than the labor you saved.
This guide walks through what the job actually involves, what you need to own or rent, the step-by-step process, and the specific points where most people make costly mistakes. It also covers when a shop visit makes more sense than DIY.
Key Takeaways
- You must know your vehicle's oil capacity, viscosity grade (like 5W-30), and filter part number before you start, all found in the owner's manual or on the manufacturer's website.
- The job requires a jack and jack stands (or ramps), a drain pan, a filter wrench, and new oil — renting a jack from an auto parts store costs $10 to $20 for the day.
- The most common mistakes are overfilling the crankcase, not replacing the rubber gasket on the old filter, cross-threading the drain plug, and forgetting to run the engine after refilling.
- If your car is low to the ground, has a plastic undertray you cannot safely remove, or uses a cartridge-style filter in a hard-to-reach location, a shop visit is faster and safer.
What You Need Before You Start
Gather these items before you lift the car. Missing even one means stopping mid-job to find it, which wastes time and leaves the car in an unsafe position.
Tools and equipment: A floor jack and a pair of jack stands (never rely on a jack alone — it can fail and the car will fall), or two ramps if your driveway is level. A drain pan large enough to hold your engine's oil capacity (check the manual; most cars hold 4 to 6 quarts). A wrench or socket set to fit your drain plug (usually 13mm, 14mm, or 15mm). A filter wrench — the band type or the cup type, depending on your filter's location and size. New oil in the correct grade and quantity. A new oil filter. An old rag or paper towels. A container to dispose of the old oil (many auto parts stores take it free).
Information you must have: Open your owner's manual or visit the manufacturer's website and write down the oil capacity in quarts, the viscosity grade (5W-30, 10W-40, 0W-20, etc.), and the oil filter part number. Do not guess or use what worked in your last car. Using the wrong viscosity can reduce fuel economy, increase engine wear, or trigger warning lights. Overfilling by even one quart can damage seals and cause leaks.
Lifting the Car Safely
This is the step where most DIY injuries happen. A car that falls can crush a hand, foot, or head. Take it seriously.
Park on a level, hard surface — not gravel or a slope. Engage the parking brake. If you are using a floor jack, position it under the vehicle's designated jacking point, usually a reinforced spot on the frame near each wheel. Your manual shows where these are; do not guess. Raise the car slowly and only high enough to slide under safely. Once the car is up, place jack stands under the frame at a second set of support points, lower the car onto the stands, and leave the jack in place as a backup. Never work under a car supported only by a jack.
If you are using ramps, drive the front wheels (or rear wheels, depending on which end you are working on) slowly up the ramps until the car is stable. Set the parking brake and place wheel chocks behind the wheels that are still on the ground.
Draining the Old Oil
Position your drain pan under the drain plug. The plug is on the bottom of the engine, usually toward the front or rear of the oil pan. Locate it before you lift the car if you can.
Use your wrench to loosen the drain plug by turning it counterclockwise — do not remove it yet, just break it loose. Once it turns freely, unscrew it by hand and let it fall into the drain pan. The oil will be hot if the engine has run recently, so work slowly and let it drip. This step takes 5 to 10 minutes; do not rush it. Once the flow slows to a drip, wipe the drain plug clean with a rag, inspect the rubber washer on the plug (it should be intact and not cracked), and set the plug aside.
If the washer is cracked or missing, you must replace it before reinstalling the plug. A missing or damaged washer will cause the plug to leak. Many auto parts stores sell replacement washers for a dollar or two.
Removing and Installing the Filter
The oil filter is usually a cylindrical cartridge screwed onto the engine or, less commonly, a cartridge that slides into a housing on top of the engine. Locate yours before you start.
For a spin-on filter (the most common type), position your drain pan underneath and use the filter wrench to loosen it by turning counterclockwise. Once it is loose, unscrew it by hand and let the remaining oil drain into the pan. Wipe the filter mounting surface on the engine clean with a rag — any old rubber or debris will prevent the new filter from sealing.
Take the new filter and coat the rubber gasket (the ring on the top of the filter) lightly with fresh oil. This helps it seal and makes removal easier next time. Screw the new filter on by hand until the gasket touches the engine, then turn it another three-quarters of a turn. Do not use the wrench to tighten it; hand-tight is correct. Over-tightening will damage the gasket and make the filter leak or stick next time.
If your car uses a cartridge filter in a housing, follow the same principle: drain the old filter, clean the housing, install the new filter and gasket, and hand-tighten the housing cap.
Refilling and Running the Engine
Lower the car back to the ground using the jack, or drive it off the ramps. Open the hood and locate the oil filler cap, usually labeled with an oil can symbol. Unscrew it and set it aside. Place a funnel in the opening and pour in the new oil slowly, checking the level as you go.
Most cars have a dipstick (a long rod with markings) or an electronic oil level display on the dashboard. If you have a dipstick, pull it out, wipe it clean, reinsert it fully, and pull it out again to read the level. The oil should be between the minimum and maximum marks. If you have an electronic display, start the engine and let it run for a few seconds, then turn it off and wait 30 seconds for the level to register on the dashboard.
Start the engine and let it idle for 30 seconds to a minute. This circulates the new oil through the engine and filter. Watch the dashboard for an oil pressure warning light; it should go out within a few seconds of starting. If it stays on, turn off the engine when ready and check that the filter is tight and the oil level is correct. Once the engine has run, turn it off and wait five minutes for the oil to settle, then check the level again and top up if needed.
Common Mistakes That Damage Engines
Overfilling: Adding too much oil is the most frequent error. Extra oil foams in the crankcase, reduces lubrication, and can damage seals and gaskets. Check the level with the dipstick or display after every quart you add, not just at the end.
Forgetting the filter gasket: If you install a new filter without coating the gasket with oil, or if the old gasket is still stuck to the engine when you install the new filter, the new gasket will not seal. The filter will leak or the engine will lose oil pressure. Always wipe the mounting surface clean and coat the new gasket lightly with fresh oil.
Cross-threading the drain plug: If you screw the plug back in at an angle, the threads will strip and the plug will leak. Start the plug by hand to make sure it goes in straight, then use the wrench to tighten it. It should be snug but not forced; over-tightening strips the threads in the pan.
Not running the engine: Skipping the test run means you do not know if the filter leaks or the oil level is correct until you drive away. Always start the engine and check for leaks before you consider the job done.
When to Take Your Car to a Shop Instead
Some cars are not practical for DIY oil changes. If your vehicle has a plastic undertray that covers the drain plug and filter, removing it safely takes time and tools you may not have. If the car is very low to the ground, you may not be able to fit under it safely even with a jack and stands. If the filter is mounted in a tight spot — such as behind the engine or under the intake manifold — a filter wrench may not fit and you could spend an hour on a 10-minute job.
Synthetic oil changes also take longer because the oil is thicker and drains more slowly. If you are changing from conventional to synthetic (or vice versa), you may need to flush the system, which is beyond a basic oil change. Some newer cars with electronic oil monitors require a reset procedure after the change, which a shop can do but you may not be able to do at home.
If you are unsure whether your car is a good candidate for DIY, ask a shop during a routine visit or check online forums for your specific make and model. A 30-minute job on one car can be a two-hour frustration on another.
Frequently Asked Questions
How often should I change my oil?
Check your owner's manual. Most newer cars with synthetic oil go 7,500 to 10,000 miles between changes. Older cars or those using conventional oil typically need a change every 3,000 to 5,000 miles. Some cars have electronic reminders that tell you when the next change is due based on driving conditions.
Can I pour old oil down the drain or in the trash?
No. Used oil is toxic and contaminates groundwater. Most auto parts stores, quick-lube shops, and municipal hazardous waste facilities take used oil free of charge. Some will even take it if you did not buy oil from them. Call ahead to confirm they accept it.
What if I spill oil on the driveway?
Contain it when ready with kitty litter, sand, or oil absorbent. Let it sit for 15 minutes, then sweep it up and dispose of it as hazardous waste. Do not hose it down; that spreads it and makes it worse. If the spill is large or has soaked in, contact your local environmental agency for guidance.
Do I need to replace the drain plug washer every time?
Not always, but you should inspect it. If it is cracked, flattened, or missing, replace it. A damaged washer will leak. Replacement washers are cheap and prevent a slow drip that can empty your oil pan over weeks of driving.
What if the drain plug is stuck and I cannot loosen it?
explore penetrating oil (like WD-40) around the plug and let it soak for 15 minutes. Try again with a wrench that fits snugly. If it still will not budge, stop and take the car to a shop. Forcing it can strip the threads or break the wrench, and a shop has the tools to remove a seized plug without damage.