BMW 3 Series vs Mercedes C-Class — Full Sedan Comparison

Read our full BMW 3 Series vs Mercedes C-Class comparison: design, handling, specs, prices and 50th anniversary highlights. Choose your ideal executive sedan.

In an age dominated by SUVs and EVs, the BMW 3 Series and Mercedes C-Class still stand strong. This year marks a milestone: the 3 Series celebrates 50 years — from the pioneering E21 to the modern G20 and the future Neue Klasse.

  Prices, trims and residual value

The plug-in hybrid BMW 330e pushes past $55,000 with options. In Europe, the diesel 320d M Sport starts at £40,505 but rises to £48,005 with M Sport Pro, Comfort Plus and Tech packs. The Mercedes C 220 d AMG Line Premium starts at £46,215 plus £685 for Spectral Blue. Auto Express notes the BMW holds its value better — 52.6% after three years vs the C-Class at 49.5%.

 Platform, dimensions and weight

The new C-Class (W206) sits on an updated Modular Rear Architecture, 65mm longer than its predecessor and 84mm longer than the BMW. Wheelbase and track are larger too. But weight is where the difference stands out: 1,755kg for the Mercedes, 1,530kg for the BMW — nearly a quarter-ton gap due to mild-hybrid hardware and extra features.

Handling, transmission and suspension

The BMW remains the driver’s choice: precise steering, confident braking and sharp direction changes. Auto Express highlights the BMW’s heavier but more responsive steering, while its eight-speed auto is only slightly less refined than the Mercedes’ nine-speed. Adaptive dampers let the BMW shift between firmness and comfort. The C-Class stays smooth and composed, even on 19-inch alloys.

Fuel economy, hybrid tech and tax

The diesel BMW 320d achieved 56.2mpg vs the C 220 d’s 53.6mpg. The Mercedes’ mild-hybrid system helps save fuel and smooths auto start-stop, but often keeps the engine running when coasting, making the BMW slightly more efficient overall. In the US, the 330e plug-in can cover up to 22 miles on electric power alone. Both diesels sit in the 29% Benefit-in-Kind tax band.

 Boot space and interior practicality

Despite its extra length, the Mercedes boot is smaller: 455 litres vs the BMW’s 480. Inside, both cars cover practical needs: rear USBs, useful storage and Isofix points. The BMW edges ahead for rear head and shoulder room.

 Safety, driver assistance and build

Euro NCAP gave the 3 Series five stars with perfect side-impact scores and strong AEB performance. The new C-Class is yet to be rated but every Mercedes since 2013 has scored top marks. Both cars offer AEB, lane keep assist and blind spot monitoring.

Verdict and the symbol of 50 years

In its 50th year, the BMW 3 Series remains the benchmark for driving precision, with smart hybrid options and strong residuals. The C-Class answers with a calm ride and refined comfort. Together, they prove that half a century on, the four-door sports saloon is alive and well.