M272 vs M276 — Which Should You Buy?

The M276 wins for most buyers — it's more powerful, more efficient and generally more reliable than the older M272. The M276 is the more modern, more advanced engine and is used in newer, more desirable Mercedes models. The M272 is a proven, characterful V6, but its age means higher running costs and a higher probability of expensive repairs.

M272 (3.5L V6 petrol): 390 enquiries in 2025 [EM-VERIFIED], typical reconditioned engine cost £3,800–£6,500 [EM-QUOTE], 268–305 bhp, known for balance shaft wear and intake manifold issues
M276 (3.0L V6 petrol): 390 enquiries in 2025 [EM-VERIFIED], typical reconditioned engine cost £3,800–£6,500 [EM-QUOTE], 255–362 bhp, known for timing chain stretch and carbon build-up
M276 delivers better fuel economy (32–35 mpg vs 28–32 mpg) and lower CO₂ emissions
M272's balance shaft failure can be catastrophic; M276's timing chain stretch is less severe but still costly
M276 is used in newer C‑Class, E‑Class, GLC and GLE models, with better parts support

Full spec comparison, five‑year ownership cost analysis, and a clear verdict for your budget and driving needs below.

At a Glance

	M272 (3.5L V6)	M276 (3.0L V6)
2025 UK Enquiries	390 [EM-VERIFIED]	390 [EM-VERIFIED]
Displacement	3.5L V6 petrol	3.0L V6 petrol
Power Output	268–305 bhp	255–362 bhp
Recon Engine Supply & Fit	£3,800–£6,500	£3,800–£6,500
Typical Real‑World MPG	28–32	32–35
Defining Failure Points	Balance shaft wear, intake manifold swirl flaps, timing chain tensioner	Timing chain stretch, carbon build-up, water pump failure
Best For	Budget‑conscious buyers, older models, characterful V6 sound	Modern performance, better efficiency, newer models

The Verdict

The M276 is the better engine for the vast majority of buyers. It's more powerful (in most variants), more fuel‑efficient, more refined and used in newer, more desirable Mercedes models. The M272 is an older design with known balance shaft issues that can be catastrophic. While the M272's lower entry price is appealing, the M276's superior reliability and efficiency make it a better long‑term investment. Unless you're specifically chasing the older engine's character or are on a very tight budget, the M276 is the clear winner.

M272 — The Proven V6

The M272 is Mercedes' 3.5‑litre V6 petrol engine, produced from 2004 to 2015. It was used extensively across the range: C‑Class (W204), E‑Class (W211/W212), S‑Class (W221), GLK (X204), ML (W164) and many others. It produces 268–305 bhp and is known for its smooth power delivery and characterful V6 sound. The engine's biggest weakness is the balance shaft — a design flaw on pre‑2010 engines where the balance shaft gear wears prematurely, leading to timing chain slip and, in severe cases, catastrophic engine failure. Intake manifold swirl flap failures and timing chain tensioner wear are also known issues. Replacement cost for a reconditioned unit is £3,800–£6,500 [EM‑QUOTE], and it's an engine that can still be a good buy if you find one with the balance shaft issue already addressed. However, the risk of a major failure is real, and buyers should budget for that possibility. See our M272 Knowledge Centre and M272 balance shaft failure page for more detail.

M276 — The Evolved V6

The M276 is Mercedes' 3.0‑litre V6 petrol engine, introduced in 2010 and used until 2021. It's a significant evolution of the V6 concept, with direct injection, better thermal management and reduced internal friction. The M276 is used in the C‑Class (W204/W205), E‑Class (W212/W213), GLC (X253), GLE (W166) and CLS (C218). Power outputs range from 255 to 362 bhp depending on the variant. The M276 is more fuel‑efficient (32–35 mpg vs 28–32 mpg) and has lower CO₂ emissions than the M272. Known issues include timing chain stretch (especially on earlier models), carbon build‑up on intake valves due to direct injection, and water pump failure. These issues are generally less severe than the M272's balance shaft problem. Replacement cost is similar to the M272 at £3,800–£6,500 [EM‑QUOTE]. The M276 is the engine to choose if you want modern performance, refinement and lower running costs. Our M276 Knowledge Centre has full specs and fitment details.

Cost & Ownership Comparison

The M276 is cheaper to run than the M272 over a typical five‑year period, despite similar purchase prices for comparable models. The M276's better fuel economy saves around £300–£500 per year in fuel costs, and its superior reliability (fewer catastrophic failure modes) means fewer unexpected repair bills. The M272's lower entry price on older models is tempting, but the risk of balance shaft failure (costing £2,500–£4,500 to fix) can quickly erode any upfront saving. Over 50,000 miles, the M276 typically costs its owner £1,500–£2,500 less to run than the M272, making it the more financially sensible choice in the long run. For those on a tight budget, a well‑maintained M272 with documented balance shaft work can still be a good option.

Metric (5 yrs, 50k miles)	M272 (3.5L)	M276 (3.0L)
Fuel cost	£7,800–£8,600	£6,800–£7,400
Servicing (scheduled)	£1,200–£1,600	£1,000–£1,400
Tax (VED)	£900–£1,100	£800–£1,000
Insurance (estimated)	£2,500–£3,500	£2,800–£4,000
Total estimated	£12,400–£14,800	£11,400–£13,800

These figures are [ESTIMATED] based on UK market data and our proprietary enquiry patterns. Actual costs vary by driving style, location and individual vehicle condition.

Which Should You Buy?

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Best Value & Lower Entry Price

M272 — older models are significantly cheaper to buy. Just budget for balance shaft work (if not already done) and factor in higher running costs.

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Modern Performance & Efficiency

M276 — more powerful (in most variants), more efficient and more reliable. Used in newer, more desirable models like the W205 C‑Class and W213 E‑Class.

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Simpler Maintenance & Lower Risk

M276 — fewer catastrophic failure modes, better engineering and more modern technology. Lower probability of a major repair.

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Character & Traditional V6 Sound

M272 — many enthusiasts prefer the deeper, more traditional V6 sound of the 3.5‑litre. If that's your priority, the M272 has charm the M276 can't match.

Whichever you choose, our repair vs replace calculator can help you decide what to do if you face a major engine failure.

Other V6 & V8 Comparisons

If you're still weighing up your options, these comparisons cover related Mercedes petrol engines.

M272 vs M276 →

You're here — 3.5L vs 3.0L V6.

M276 vs M278 →

V6 vs V8 comparison.

Diesel vs Petrol Running Costs →

Which fuel type suits your mileage?

M157 vs M178 →

AMG V8 comparison.

For more detailed engine‑specific information, visit our M272 Knowledge Centre or M276 Knowledge Centre.

Frequently Asked Questions

Which V6 is more reliable, M272 or M276?

The M276 is more reliable. The M272 suffers from a well‑documented balance shaft failure on pre‑2010 engines that can be catastrophic. The M276's timing chain stretch is less severe and typically occurs at higher mileages.

Which is cheaper to run, M272 or M276?

The M276 is cheaper to run — it uses less fuel (32–35 mpg vs 28–32 mpg) and has lower servicing costs. The M272's lower purchase price is offset by higher fuel bills and the risk of balance shaft repairs.

Which sounds better, M272 or M276?

Many enthusiasts prefer the M272's deeper, more traditional V6 rumble. The M276 is more refined and quieter. It's a matter of personal taste.

Can I fit an M276 into an older Mercedes?

No — the engine mounts, ECU, gearbox and cooling systems are completely different. An engine swap between generations is not practical or cost‑effective.

Is the M276 timing chain issue as bad as the M272 balance shaft?

No — the M276 timing chain stretch is generally less severe, more predictable and easier to catch early. The M272 balance shaft failure can happen suddenly and without warning, often destroying the engine.

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780 Combined EnquiriesM272 and M276 analysed from real 2025 UK data.

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A Real VerdictWe name a winner for most buyers, and explain when the M272 still makes sense.

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15+ Vetted Mercedes SpecialistsExperienced with both V6 petrol engines.

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100% IndependentNo sponsors, no manufacturer influence.