Tell me your year and model and what you're seeing — drips, burning smell, or oil in the coolant. I'll tell you straight if it's the M276 oil-cooler seals and flat-quote the fix at your driveway.
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A burning-oil smell after driving, oil drips, or oil mixing into the coolant on a Mercedes V6 (the M276 in the C350, E350, GLK350, ML350, GLE350 and more) is almost always the oil-cooler and filter-housing seals. The oil cooler sits in the engine valley between the cylinder banks; its seals harden and leak oil — and sometimes let oil and coolant mix. Getting to it means the intake comes off, which is most of the job. Dealers quote $1,800–$2,800; Cars With Fares does it for a flat quote first. Call or text 647-450-0406.
Your C350, E350, GLK, ML or GLE has a burning smell after you park it, maybe drips on the driveway, and possibly oil showing up where it shouldn't — in the coolant. The dealer quoted a number that felt steep for "a leak." On a Mercedes V6 this is one of the most common leaks there is, and it has a very specific source. Here's the real picture.
I'm Fares, a mobile mechanic in Mississauga, and euro oil leaks are bread-and-butter for me — Mercedes especially. The M276 V6 oil cooler is a leak I do regularly, and the reason the quote looks big is the access, not the part.
Your engine is the M276 — Mercedes' 3.5L V6 in a huge spread of cars: C350, E350, GLK350, ML350, GLE350, GL350, S400 and more, roughly 2012 onward. It's a good engine. Its classic leak point is the oil cooler (and the related oil-filter-housing seals), which sits down in the valley between the two cylinder banks, under the intake.
The oil cooler runs engine oil and coolant side by side to manage oil temperature, separated by seals. Over time and heat cycling those seals harden and shrink and start to leak. Usually it leaks oil externally — onto the hot engine — which is your burning smell and the drips. In some cases the seal between the oil and coolant sides lets the two mix, so you get oil in the coolant (or a slightly milky look) and coolant loss. Either way, the fix is the same area.
Because it's buried under the intake manifold, the intake has to come off to reach it — that access is most of the labour, which is why a "small leak" carries a real number.
I confirm where it's actually coming from — Mercedes V6s also leak from the valve covers and cam-adjuster solenoid seals, and I'd rather pinpoint the source than have you pay to open the intake for the wrong gasket. If multiple things are weeping, I'll lay out doing them together since the engine's already open.
The proper repair: remove the intake manifold to access the valley, replace the oil-cooler seals and the oil-filter-housing seals with updated parts, and — if the oil and coolant were mixing — flush the cooling system so there's no oil left in it. Since the intake's already off, it's the smart time to handle any valve-cover or cam-solenoid seal leaks in the same visit rather than pull it apart again later.
Straight numbers. The exact figure depends on whether it's just the cooler seals or a few leak points bundled, but here's the honest GTA range.
Dealer: typically $1,800–$2,800
At your driveway with Cars With Fares: usually $1,400–$1,900 for the oil-cooler and filter-housing seals, flat-quoted before any work.
That's intake off, seals replaced with updated parts, reassembly — one number. What swings it: adding a coolant flush if oil got in, and bundling valve-cover/cam-solenoid seals while it's open.
It lands under the dealer because there's no service-department overhead on top — same job, done once, with the access done right. The savings is the byproduct; you're paying for the leak found at its source and fixed properly so the smell and drips are gone.
This is a leak that shops love to keep your Mercedes for because pulling the intake ties up a bay. I do it at your driveway across the GTA, and because you're right there I can show you the oil-soaked seals when they come out and the clean valley after. On a euro car where "it's just a leak" turns into a four-figure quote, seeing the actual source and getting a flat number up front is exactly the trust that matters. No car held at a dealer for days, no surprise add-ons.
An external oil leak isn't an instant emergency, but oil dripping on a hot exhaust is a smell-and-smoke nuisance and, over time, a fire-risk you don't want — and you'll keep topping up oil. Get it on the books before it gets worse. If oil and coolant are mixing, treat it as more urgent: contaminated coolant doesn't protect the engine and running it that way is hard on it. Either way, the sooner the source is fixed, the smaller the job stays.
Tell me your year, model and what you're seeing — drips, burning smell, or oil in the coolant — and I'll tell you if it's the M276 oil-cooler seals and quote the fix at your driveway.
Get My Quote →Replacing the M276 oil-cooler and filter-housing seals runs roughly $1,400–$1,900 done at your home, versus $1,800–$2,800 at a dealer. Most of the cost is access — the intake manifold has to come off to reach the valley, not the part itself. The number goes up if oil got into the coolant and a flush is needed, or if you bundle the valve-cover and cam-solenoid seals while it's open. I flat-quote it before any work after confirming the source.
It's the M276 3.5L V6, in a wide range of cars roughly 2012 onward: C350, E350, GLK350, ML350, GLE350, GL350, S400 and more. The oil cooler sits in the valley between the cylinder banks under the intake, and its seals harden and leak as the car ages, usually showing as a burning-oil smell, drips, and sometimes oil mixing into the coolant. The related oil-filter-housing seals leak in the same area, so they're typically done together.
It needs proper attention. On the M276, oil getting into the coolant is usually the oil-cooler seal between the oil and coolant sides failing, which is fixable in the same job as the external leak. But you shouldn't just keep topping up — oil-contaminated coolant doesn't protect the engine and degrades the cooling system, so it needs the source fixed and the system flushed. I confirm it's the oil-cooler seal and not a deeper internal problem before quoting, so you're not paying for the wrong fix.
Yes — it's a driveway job across Mississauga and the GTA. I pull the intake to reach the valley, replace the oil-cooler and filter-housing seals with updated parts, flush the cooling system if oil got in, and handle any valve-cover or cam-solenoid leaks while it's open so it's only apart once. Because you're right there, I can show you the oil-soaked seals coming out, and the flat quote you got up front is the number you pay.
Mercedes leaking oil? European car specialist · Oil leak repair · Cooling system · get a flat quote
I find the leak at its source and do the M276 oil-cooler seals right at your driveway across the GTA. Flat quote before any work starts.
Call 647-450-0406