In order to improve emissions, Mercedes-Benz has decided to pull the E350d from sale in Germany for re-engineering
30 August 2017

Mercedes-Benz has suspended sales of the E350d in Germany following a decision to re-engineer the turbocharged 3.0-litre V6-powered diesel model’s exhaust gas after-treatment system as part of a recertification process.

The E350d went on sale in May in both saloon and estate guises following the re-engineering of the previous model’s exhaust gas after-treatment system. Mercedes now claims to have identified further changes for its so-called OM642 LS engine that will allow it to claim lower NOx emissions for the popular diesel model.

Among the changes to be made to the E350d is the fitting of a larger SCR catalyst. “With corresponding changes to the injection process, this will allow the system to run more efficiently,” a Mercedes official with knowledge of the E350d’s pending recertification told Autocar.

The adoption of a larger SCR catalyst provides a larger surface area for the atomisation of the AdBlue solution, in turn increasing its ability to neutralise NOx emissions.  

Mercedes denies it has been forced to fit a larger AdBlue tank to the diesel E350d as part of the changes, as the recertified system is claimed to use the same amount of AdBlue solution in each injection, thus ensuring it will not be emptied between servicing intervals.

“It is the larger surface area of the new catalyst that is key to the efficiency gains,” says Autocar’s source.

The E350d uses a 24.5-litre AdBlue tank, while larger models, including the GLE 350d and GLS 350d, have a 38.5-litre tank.

Mercedes will not confirm when the E350d will go on sale again, but says the recertification should take “a few weeks”.

Related stories: 

Mercedes-Benz E350d review 

Our Verdict

Mercedes-Benz E-Class

The Mercedes-Benz E-Class comes with fine engines and a typically laid-back dynamic character. Not one for the interested driver, but a good advert for being disinterested.

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Comments
11

db

30 August 2017

On a drive back from work tonight I was behind a couple of very smokey C200 15 plate diesels with almost James Bond smoke screen special effects when their drivers put their foot down or changed gear. There might be a few more engineering problems out there for them not sure how so much smoke gets through the particulate filters !

30 August 2017
db wrote:

On a drive back from work tonight I was behind a couple of very smokey C200 15 plate diesels with almost James Bond smoke screen special effects when their drivers put their foot down or changed gear. There might be a few more engineering problems out there for them not sure how so much smoke gets through the particulate filters !

You shouldn't routinely see smoke from the exhaust of a DPF equipped car unless it is doing a regeneration even then it's minimal 

jer

30 August 2017

So the older CLS and E350 that use the same engine are still good to go? What would merit this this hasty running change before the straight 6 replacement to justify taking off sale?

30 August 2017

They can fit it with a 100 litre AdBlue tank and then throw it in the bin where it belongs.

31 August 2017

Whilst they're at it maybe they could re-engineer the motor to actually have some power...

I drove a CLS350CDI last year and it was turbine smooth but my word was it slow.

The 9 speed 'box which never really seemed to know what it was doing didn't help.

Couldn't wait to get back into my 335dx.

31 August 2017

Why have these Mercs got such enormous AdBlue tanks? How much of this stuff are they getting through? Given the cost of it, shouldn't it be included in road test running costs data? 

31 August 2017

don't forget to add  it to the running costs. Fuelled up with 62 litres of diesel and 38 of Adblue that's some weight too!

typos1 - Just can’t respect opinion

31 August 2017

Mercs not taking enough pi** so they have to modify the vehicle to take the full amount of pi**

31 August 2017

Mercedes-Benz should fit the new SCR to its F1 car. It's the biggest oil burner of the field . . . and now they've been given special dispensation to retain the 1.2 litre tank. Bloody disgrace. They pretend to care about NOx in their road cars but have no problem developing an oil burning system for F1. Perhaps the W08 should be classed as a diesel . . . and subsentley banned!  

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