The fastest way to know what's leaking: go by the colour, where it's pooling, and the smell. Dark brown/black = oil. Bright green, orange or pink = coolant. Red = transmission or power steering. Clear-to-yellow and oily near a wheel = brake fluid (stop driving). Clear and watery on a hot day = just AC water, no problem. Cars With Fares finds the exact source in your driveway across the GTA — no guessing — then gives you a flat quote. Call or text 647-450-0406.

You back out of the driveway and there it is: a wet spot on the concrete where your car was sitting. Or you notice a drip at a parking lot in Mississauga and your stomach drops. The first question is always the same — is this a $200 problem or a $2,000 problem, and is it safe to keep driving?

Good news: a leak tells you most of what you need to know before anyone touches the car. Car fluids are colour-coded on purpose so they can be told apart. I'm a mobile mechanic based in Mississauga, and "I'm leaking something, not sure what" is one of the most common messages I get. Here's the honest, no-fluff way to identify it — and roughly what each one costs to fix at a GTA shop or dealer.

First: A 30-Second Test Anyone Can Do

Before you panic, do this. Slide a clean piece of cardboard or a flattened cereal box under the car where it parks, leave it overnight, and look at it in the morning. You'll have three clues that tell you almost everything:

• Colour — the single biggest tell. Each fluid has a distinct colour (at least when it's fresh).
• Location — front, middle, or near a wheel narrows down which system it came from.
• Smell & feel — sweet, burnt, or oily-and-greasy each point in different directions.

One quick warning: a brand-new car parked over a clean spot on a humid GTA summer day will often drip clear water from the AC. That's normal (more on that below). Everything coloured or oily is worth identifying. Let's go colour by colour.

Dark Brown or Black, Oily, Under the Engine = Engine Oil

Location: front half of the car, under the engine bay. Smell: oily, sometimes a hot/burnt smell if it's hitting the exhaust. Urgency: medium to high.

Fresh oil is amber, but on the ground an oil leak almost always looks dark brown to black and feels slick and greasy between your fingers. This is the most common leak I get called for. The usual sources, from most to least common:

• Valve cover gasket — the rubber seal at the top of the engine hardens and seeps. Very common on BMW, Audi and Mercedes, and it's often what causes that burning-oil smell when oil drips onto hot exhaust.
• Oil filter housing gasket — another top European leak point (and the Chrysler/Jeep 3.6 Pentastar).
• Oil pan gasket or drain plug — at the very bottom of the engine.
• Rear main seal — where the engine meets the transmission; a bigger job because of where it sits.

An oil leak rarely strands you on the spot, but it's not "ignore it" either: oil dripping onto a hot exhaust is a smoke-and-smell hazard, and a slow leak that drops your level too far can do real engine damage. The smart move is to find which gasket it is before it gets worse. We do this all the time — see the BMW oil-leak breakdown and our mobile oil-leak repair.

Bright Green, Orange or Pink, Sweet Smell, Front-Center = Coolant

Location: front and center, under the radiator or engine. Smell: distinctly sweet, almost like syrup. Urgency: high — overheating risk.

Coolant (antifreeze) is dyed bright on purpose — usually green, orange, pink, or sometimes yellow/blue depending on the type your car uses. The dead giveaway is the smell: it's sweet, not oily. If you've got a coloured puddle near the front-center of the car and it smells sweet, treat it as coolant. The common sources:

• Water pump — leaks from a weep hole or its gasket; often the first to go.
• Radiator — cracks at the plastic end-tanks, especially on older cars.
• Hoses & clamps — rubber hoses split or the clamps loosen with age.
• Gaskets — thermostat housing, water-outlet, or worse, a head gasket if coolant is disappearing with no visible puddle.

Coolant leaks are urgent because losing coolant means your engine can overheat — and an overheated engine is how a cheap repair turns into a destroyed head gasket or a new motor. Sweet smell plus a temperature gauge creeping up means stop and call. (Read what to do if you're overheating.) We handle this with mobile cooling-system repair.

Red or Reddish-Brown, Oily, Mid-Car = Transmission or Power-Steering Fluid

Location: middle of the car (transmission) or front near the steering (power steering). Smell: oily; transmission fluid can smell slightly burnt. Urgency: medium.

Red or reddish-brown oily fluid is almost always one of two things, and where it pools tells you which:

• Transmission fluid — pools more toward the middle of the car, under the transmission/bellhousing. Fresh ATF is bright red; older fluid goes brown and can smell burnt. A trans leak that runs the fluid low can cause slipping or harsh shifts, so it's worth catching early.
• Power-steering fluid — many cars use a red/pink ATF-style fluid too, but it pools toward the front, near the steering rack or pump. The tell is in the wheel: a low or leaking system often whines when you turn and the steering feels heavier.

Neither usually strands you immediately, but both get worse and both can damage the component if you run them dry — and a fluid film on a hot engine bay isn't something to leave. Worth identifying and sealing.

Clear-to-Yellow, Oily, Near a Wheel or the Firewall = Brake Fluid

Location: behind a wheel, or under the firewall near the brake pedal. Smell: faint, slightly oily. Urgency: stop driving — this is a safety issue.

Brake fluid leaks come from a corroded steel brake line (very common on salted Ontario cars), a failing caliper, a wheel cylinder, a rubber hose, or the master cylinder. The good news is that brake work — lines, calipers, hoses, bleeding the system — is squarely in the wheelhouse of mobile repair and we can do it at your location. The bad news is it's genuinely unsafe to ignore, so this is the leak to act on the same day. See mobile brake repair.

Light Brown & Thin = Older Power Steering or Gear Oil (and Other Honourable Mentions)

A couple of leaks don't fit neatly into the colours above:

• Light brown, thin fluid — can be older/clear-type power-steering fluid or, on rear-wheel-drive vehicles and trucks, gear oil from a differential or transfer case. It has a strong, almost sulfur-like smell if it's gear oil.
• Windshield washer fluid — blue, green or orange and watery (not oily), usually from the front. Harmless to the car; you just top it up or fix a cracked reservoir.
• Fuel — if you smell strong gasoline and see a thin, fast-evaporating wet spot, that's a fuel leak. That's a stop-driving, get-it-checked-now situation for fire safety.

Clear, Watery, No Smell, Under the AC Area on a Hot Day = Nothing to Worry About

Here's the one that panics people for no reason. If it's a hot or humid GTA day, you've been running the AC, and you find a small clear, watery, odourless puddle toward the front-passenger side — that's just AC condensation. Your air conditioning pulls moisture out of the cabin air and drains it onto the ground, exactly like a cold glass of water "sweats." It's clean water. No colour, no oily feel, no smell = nothing to fix.

The only time clear water is worth a second look is if it's coming from somewhere it shouldn't, or if you're also seeing your AC not blow cold — but a plain water drip under a working AC on a hot day is normal.

Quick Reference: Leak by Colour

Roughly What These Cost to Fix in the GTA (2026)

The honest truth: you can't put a real number on a leak until you know exactly where it's coming from. Two cars "leaking oil" can be a $300 valve-cover gasket or a much bigger rear-main job. These are typical GTA shop/dealer ranges to give you a feel — the exact number is a flat quote after the source is found:

We Come to You — Fares Finds the Source in Your Driveway

This is where mobile service actually shines. You don't need to risk driving a leaking car to a shop and then wait around. Right where your car is parked — your driveway, your workplace lot, anywhere in the GTA — I can:

• Pinpoint the exact source — clean the area, add UV dye if needed, and find which gasket, hose, line or seal is leaking. No "we'll have to open it up to know."
• Fix most leaks on-site — reseal gaskets, replace hoses, water pumps, power-steering and brake lines, and top up the fluid.
• Tell you straight if it's one of the rare jobs that genuinely needs a hoist and the car apart — instead of pretending otherwise.

So if you just messaged someone "leaking fluid" and you're not even sure what it is — that's exactly the kind of thing I scope every week. Send me the colour, where it's pooling, and the smell (a photo of the puddle on cardboard is perfect), and I'll tell you what we're likely looking at before I even arrive. We do mobile leak repair and full diagnosis across Mississauga, Toronto, Oakville, Burlington and the surrounding GTA.

Frequently Asked Questions