Updated November 2026 by the O’Leary’s Automotive Repair team.
The short answer: a few drops of oil under your car are not an emergency, but they are a warning. Check your dipstick today. If the oil level is fine and the spot is smaller than a coin, book an inspection in the next week or two. If you see a puddle, the oil warning light comes on, or you smell burning oil or see smoke from under the hood, stop driving and have it looked at right away.
First, make sure it is engine oil
Slide a piece of white cardboard under the engine overnight and look at the color in the morning.
- Amber, brown or black and slick: engine oil.
- Red or pink: transmission or power steering fluid.
- Green, orange or pink with a sweet smell: coolant (antifreeze). Keep pets away from it.
- Clear to light yellow and slick, near a wheel: possibly brake fluid. Treat this as urgent.
- Clear and odorless water near the front passenger side: normal air conditioning condensation, especially in a Wilmington summer.
How urgent is it?
Book a visit soon if you see a few drops a day, the dipstick reads between the marks and the engine runs normally. Most small leaks are slow seeps from aging gaskets.
Get it checked right away if any of these are true:
- The oil pressure light or “low oil” message comes on.
- You smell burning oil or see blue-gray smoke from the hood or tailpipe. Oil dripping onto a hot exhaust is a fire risk.
- The dipstick reads below the minimum mark, or you are adding more than a quart between oil changes.
- You see a puddle rather than drops.
Running an engine low on oil wears the bearings and can seize the engine, which turns a modest repair into an engine replacement.
What usually causes an oil leak
- Valve cover gasket: on top of the engine. Oil runs down the side and can drip onto the exhaust, which is where the burning smell comes from.
- Oil pan gasket: at the bottom of the engine, a common source of drips under the middle of the car.
- Drain plug or its washer: loose, stripped or reused washers seep after oil changes.
- Oil filter: a loose filter or a doubled-up old gasket.
- Front and rear crankshaft seals: worn seals at either end of the engine. A rear main seal leak shows up between the engine and transmission.
- Oil pressure sensor or oil cooler lines: less common, but they can leak quickly.
What the repair involves
We start by cleaning the area and tracing the oil to its highest wet point, because oil runs downhill and the drip is rarely where the leak starts. On some cars we add a dye to the oil and check it under UV light after a short drive. Once the source is clear, we explain the fix and the price before doing any work.
Repairs range widely. A drain plug washer or oil filter takes minutes during an oil change. Valve cover and oil pan gaskets are common, moderate jobs. A rear main seal is a large job because the transmission has to come out to reach it.
What it costs in the Wilmington area
There is no single price for an oil leak, because the part that failed decides the labor. That is why we diagnose first and quote before we start. If the leak turns out to be the drain plug or filter, it is handled with a regular oil change. At O’Leary’s a standard oil change starts at $29.99 and a synthetic oil change starts at $69.99, as listed on our oil change service page, and every oil change includes a look at your fluids so leaks get caught early.
Frequently asked questions
Is it safe to drive with a small oil leak?
Usually yes, for a short time, if the dipstick shows oil between the marks and no warning light is on. Check the level every few days and top it up as needed until the leak is repaired. If the oil light comes on, you smell burning oil or you see smoke, stop driving and call us.
How can I tell if the drip under my car is engine oil?
Put a piece of white paper or cardboard under the engine overnight. Engine oil is amber to dark brown or black and feels slick. Red or pink usually means transmission or power steering fluid, green, orange or pink with a sweet smell means coolant, and clear water near the front passenger side is normal air conditioning condensation.
Can an oil change fix an oil leak?
Sometimes. If the leak comes from a loose drain plug, a worn drain plug washer or a poorly seated oil filter, it is fixed during the oil change. Leaks from gaskets and seals need their own repair. Your technician can tell you which it is during the visit.
Do stop-leak additives work?
They can slow a seep from an aging seal for a while, but they do not repair a failed gasket and are not a substitute for finding the source. Ask us before adding one.
Why does my car only leak oil after it has been parked?
Oil drains down to the bottom of the engine when it is off, so a worn oil pan gasket, drain plug or rear seal drips most while the car sits. A drip after parking is still worth checking.
How much does it cost to fix an oil leak in Wilmington?
It depends entirely on where the oil is coming from. A drain plug or filter fix costs little more than an oil change, while a rear main seal means removing the transmission. We find the source first and give you the price before any work starts.
Book at the O’Leary’s nearest you
Our three service centers handle oil leak diagnosis, gasket and seal repairs and oil changes for drivers across New Hanover, Brunswick and Pender counties.
- Wilmington Service Center: 6905 Market St, Wilmington, NC 28411. Call 910-791-8800
- Leland Service Center: 72 Gregory Rd NE, Leland, NC 28451. Call 910-371-1844
- Hampstead Service Center: 13821 US Highway 17, Hampstead, NC 28443. Call 910-270-2729
Make an appointment online and pick your location, or call the shop closest to you. Current deals are on our Coupons and Specials page.
