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VERDICT · SAME BALANCE SHAFT CHECK, MORE POWER

Mercedes-Benz C300 3.5L (C350)
is it a safe used buy?

The larger-displacement V6 option on this same C-Class generation — more power than the C300, but built on the identical M272 family with the identical balance shaft gear concern.

GENERATIONW204 (2008–2014)
ENGINE3.5L M272 V6
POWER268 hp
USED PRICE$10,500–18,500

How the engine fits this car

Genuinely stronger performance than the C300 on the same chassis, but mechanically it's the same M272 family — the balance shaft gear concern detailed on the dedicated engine page applies without exception.

If you're cross-shopping against the C300, the engine-specific risk is identical; the decision comes down to performance preference and price, not reliability.

Mercedes-Benz C300-specific pros and cons

This is about the car itself — for engine-specific failure points, see the dedicated engine page below.

WHAT HOLDS UP WELL

  • Genuinely stronger, more satisfying performance than the C300 on the same chassis
  • A confirmed, repaired example (with the revised balance shaft gear) is a meaningfully safer, well-understood buy
  • Smooth, refined power delivery characteristic of Mercedes engineering of this era
  • Strong independent specialist knowledge given how thoroughly this issue has been documented

WHAT TO WATCH

  • Balance shaft gear wear, detailed in full on the engine page, applies identically to this larger-displacement version
  • Verifying repair completion requires real diligence, not just a general assurance from the seller
  • Purchase price runs higher than the C300 for the same generation
  • A rattling noise on cold start is a documented warning sign worth taking seriously

Pricing on the used market

Repair status
Typical price
What to expect
Repaired, documented
$15,000–18,500
Meaningfully safer, specialist-verified
Original, no symptoms
$12,500–15,000
Budget for the repair proactively
Original, rattle present
$10,500–12,500
Treat with real caution

The engine itself

This C350 shares its M272 V6, and that engine's balance shaft concern, with the related C300. The full checklist lives on the shared engine page.

FULL ENGINE BREAKDOWNMercedes-Benz M272/M273 V6/V8 — Reliable or Not →

Pre-purchase checklist for this generation

Ask whether the balance shaft gear has been proactively replaced, and get documentation if so.

Listen for a rattling noise on cold start that may lessen as the engine warms.

Find a Mercedes specialist rather than a generalist mechanic for any pre-purchase inspection.