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Leaks

Oil Spots Under Your Car: What's Leaking and Why

By Fares · Updated August 17, 2026 · 5 min read · Mobile, west GTA

The quick answer: Brown or black spots under your car are usually engine oil, and the most common source is a leaking valve cover gasket, an easy, common fix where oil seeps from the top of the engine, sometimes dripping onto hot parts and causing a burning smell. Other causes are an oil pan gasket, a loose drain plug or filter from a sloppy oil change, or a worn rear main seal. A small leak means watch your oil level and fix it soon; a fast leak means don't let the engine run low. Cars With Fares comes to you, get a flat quote or text 647-450-0406.

Text beats a form if you're on your phone, the message above already says what your car is doing, you just add the vehicle. He reads texts between jobs.

Finding a fresh spot on your driveway is unsettling, but the first job is just figuring out what's leaking. Color is your biggest clue: engine oil is brown when fresh and darkens to near-black as it ages. If the spot is brown or black and feels slick, you're almost certainly looking at an oil leak, and most oil leaks are far more annoying than dangerous.

The most common oil leak I find in GTA driveways is a valve cover gasket. That's the seal around the top of the engine, and when the rubber hardens with age, oil weeps out. Sometimes it drips onto the hot exhaust below and you get that faint burning-oil smell after you park. The good news: a valve cover gasket is classic gravy work, a straightforward reseal I can do at your house.

Other usual suspects are an oil pan gasket lower down, or simply a loose drain plug or oil filter left behind by a rushed oil change. The point is that the source needs to be confirmed before anyone replaces anything, chasing the wrong leak wastes your money. Let's sort out where it's coming from.

Got a shop quote, or not sure what it is? Drop a price into the free quote checker to see if it's low, in range, or high for your car. Not sure what's wrong? Ask the AI mechanic, it opens straight onto this symptom, no typing needed. Either way, Fares comes to you: send the details or text 647-450-0406.

What it sounds and feels like

People describe this a few different ways. If any of these match what you're noticing, you're in the right place:

The most likely causes, ranked

From most to least common, here's what usually causes this, in plain English, with the actual parts named:

Leaking valve cover gasket

The most common oil leak. The valve cover gasket seals the top of the engine, and over time the rubber hardens and weeps oil. It often drips onto the hot exhaust manifold, which is what causes that burning-oil smell after you shut down. Resealing it is a straightforward, gravy driveway fix.

Oil pan gasket or loose drain plug

Down at the bottom of the engine, the oil pan gasket can seep with age, or the drain plug can be loose or have a worn washer. Either drips oil from the lowest point of the engine. The fix is a reseal or a properly torqued plug with a fresh washer.

Sloppy previous oil change

A surprisingly common cause: a loose or cross-threaded oil filter, or a drain plug that wasn't tightened properly last time, leaves oil weeping right after a service. It's usually the simplest fix of all, reseat the filter or snug the plug correctly.

Worn rear main seal

Bigger and less common. The rear main seal sits where the engine meets the transmission, and a worn one leaks from the back of the engine. It's more involved than the gaskets above, so confirming it's actually the rear main, and not a higher leak running down, matters before committing to the job.

How urgent is it? Is it safe to drive?

Depends on the leak size, monitor your oil level

A small leak is usually fine to drive on short-term as long as you check your oil level regularly and top it up, just get it fixed before it worsens. A fast leak is more serious: never let the engine run low on oil, because oil starvation can cause real engine damage. When in doubt, check the dipstick before you drive.

What it typically costs to fix in the GTA (2026)

These are honest GTA shop and dealer ranges so you have a feel for the number, they are not my price. My own published band is right below the table, and your flat quote comes once the actual cause is confirmed, so you're never paying for a guess:

Likely fixWhat's involvedTypical GTA shop/dealer cost
Valve cover gasketReseal the top-of-engine gasket and clean up the leak$250–$550
Oil pan gasketDrop and reseal the oil pan, refill with oil$300–$700
Drain plug / filter resealReseat the filter or replace the drain plug washer and re-torque$80–$200
Why the ranges are wide. Oil-leak ranges depend on which gasket is leaking and how hard it is to reach on your engine, a valve cover buried under an intake manifold takes longer. These are typical GTA shop ranges for context, not a quote. Want to sanity-check a quote you already have? Run it through the free quote checker, or see typical GTA numbers on the repair price index.

And what do I charge?

Fair question, and it's the one nobody answers on pages like this. Here's my published band beside the market's, so you can see both before you talk to anybody:

What I charge, and what the market charges
GTA shops & dealers $80–$700

The full spread from the table above, smallest scenario to biggest. Market context so you can tell fair from silly, not my price, and I have no say in what a shop bills.

Cars With Fares, published, flat $250–$900

That's my published band for oil leaks, valve cover & gaskets, installed, the same range my quote form and my AI mechanic quote from, once the actual cause is confirmed.

Inline-4 valve cover gasket$250–$500
V6, front (accessible) bank only$300–$550
V6, both banks, rear under the intake$500–$900
European (BMW/Audi) valve cover job$600–$1,100
Read the two columns properly: they overlap, and I'm not claiming to be the low-price option. What's different is how you get quoted. A shop bills per line item, usually once the car is already on the hoist. I confirm the real cause where your car is parked and give you one flat number for the whole job, parts and labour together, before any work starts. No hourly meter, nothing added afterwards, and if something doesn't need doing I say so instead of billing it. My numbers are published at /data/consumer-rate-card.json (updated 2026-07-19) so you can check them against this page.

Want a straight read on your car?

Thirty seconds, and the symptom's already filled in. You get a price range back plus real time slots you can book yourself, no waiting on a callback to find out what's wrong.

No spam. A real read on your car, not a sales call. Or text 647-450-0406.

What to do next

  1. 1Check the color: brown/black and slick = oil; red = transmission/power steering; green/orange = coolant.
  2. 2Slide a piece of cardboard under where you park overnight to see where the drip lands.
  3. 3Pull the dipstick and check your oil level, top up if it's low before driving.
  4. 4Note any burning-oil smell after parking, it points to a leak hitting the exhaust (often the valve cover).
  5. 5Book a leak inspection so the exact source is confirmed before anything is replaced.

We come to you. Fares diagnoses it in your driveway

This is where mobile service shines. There's no reason to risk driving a car with this symptom to a shop and wait around. Right where your car is parked, your driveway, your workplace lot. I confirm the actual cause (not a guess), fix the vast majority of these on-site, and tell you straight if it's one of the rare jobs that genuinely needs a shop. We handle this through mobile oil-leak repair across Mississauga, Oakville, Milton, Brampton and Etobicoke.

Frequently asked questions

how do I know if it's oil or another fluid leaking?

Go by color and feel. Engine oil is brown when fresh and black when old, and feels slick. Red or pink is usually transmission or power-steering fluid. Green, orange, or yellow is coolant. Clear and watery is often just A/C condensation, which is normal. Brown or black slick spots point to an oil leak.

is it safe to drive with an oil leak?

A small, slow leak is usually safe short-term if you keep an eye on the oil level and top it up as needed, but fix it before it grows. A fast leak is risky because running the engine low on oil can cause serious damage. Check your dipstick before driving if you're unsure.

why does my car smell like burning oil after I park?

That smell usually means oil is dripping onto a hot part of the engine or exhaust and burning off. The classic culprit is a leaking valve cover gasket up top, where oil seeps onto the exhaust manifold. It's a common leak and a straightforward reseal to fix.

how much does it cost to fix an oil leak?

It depends on the source. A loose drain plug or filter from a sloppy oil change is the simplest fix; a valve cover gasket is a mid-range reseal; a rear main seal is more involved. Confirming the exact source first means you only pay for the leak you actually have.

can you fix an oil leak in my driveway in the GTA?

Yes, valve cover gaskets, oil pan gaskets, and drain-plug or filter reseals are exactly the oil-leak jobs I do at your home across Mississauga, Oakville and Milton. I confirm the real source first, then fix it on site. Call 647-450-0406.

Noticing this on your car right now?

Ask the AI mechanic, it opens straight onto this symptom, or send me the details and I'll tell you what we're likely looking at. Then I come to you, confirm the real cause, and give you one honest flat quote before anything gets touched. mobile oil-leak repair across Mississauga, Oakville, Milton, Brampton and Etobicoke.

One text and you have a real answer. He reads them between jobs.

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