Error parsing XSLT file: \xslt\FacebookOpenGraph.xslt Mercedes S400 Hybrid: Test Drive Review
Cookies on Businesscar

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive all cookies on the Business Car website. However, if you would like to, you can change your cookies at any time

BusinessCar magazine website email Awards mobile

The start point for the best source of fleet information

Mercedes S400 Hybrid: Test Drive Review

Date: 24 December 2013   |   Author:

Mercedes' new S-class luxury saloon comes with a petrol-electric hybrid version alongside traditional petrol and diesel alternatives.

Interestingly, there's just 1g/km of CO2 between the diesel and petrol-electric hybrid powertrains, and both are impressively under 150g/km, although the hybrid is £4000 more expensive and 75hp more powerful.

There's a 5.6mpg difference in the official economy figure in favour of the diesel, but the hybrid's 44.8mpg for a near two-tonne luxury saloon capable of a speed-limited 155mph still shows how far the industry has come.

The hybrid is also 4.6 percentage points worse off from a residual value perspective, as the S350 CDI achieves a peerless 34.0% RV, while BMW, Audi and Lexus rivals can't even match the Merc hybrid's 39.4%, although the BMW 7-series Active Hybrid runs it close.

That means the S350 diesel is 10.1p per mile cheaper to run than its sibling; however, it's also worth remembering there's a plug-in S-class with figures of 69g/km and 94.2mpg coming in autumn 2014.

The outgoing S-class was the sector-leading luxury model, and the new model is another step forward in class, refinement and quality. 

The hybrid system works well at low speed and is capable of significant zero-emission running, but does have the occasional habit of being more jerky than one might expect of an S-class if the driver changes throttle pressure too quickly when the car's switching from petrol to electric mode.

But for elegant arrivals, whistling noiselessly to a standstill beats the admittedly refined diesel clatter. 

The S-class is still an epically desirable tool, and this hybrid makes it an interesting choice compared with the diesel, probably shading it for heavy city use, but being less logical if longer runs are more likely.

Mercedes-Benz S400 Hybrid
P11D price £69,455
Model price range £62,620-£119,565
Residual value 29.4%
Depreciation £49,005
Fuel £7960
Service, Maintenance and Repair £4087
Vehicle Excise Duty £390
National Insurance £6422
Cost per mile 139.5p
Fuel consumption 44.8mpg
CO2 (tax) 147g/km (21%)
BIK 20/40% per month £243/£486
Service interval variable miles
Insurance (1-50) group 49
Warranty 3yrs/unlimited miles
Boot space min/max 510 litres
Engine size/power 3498cc/333hp
Top speed/0-62mph 155mph/6.8secs
On sale October 2013


Beautifully put together, but diesel is cheaper to buy and run