How noisy is your 270cdi?

[Wirral_guy]

Although there is plenty of power, and no obvious symptoms\problems, my 270cdi is quite noisy (in a 'diesely taxi' way) when started from cold. I'm finding it hard to describe but it is almost like it is not running on all cylinders. It gets progressively better as it warms up but I can't help wondering whether this is normal or not.

Can anyone with a 270cdi give their thoughts on what their's sounds like on startup?

Dave

 

[HelpThisDude]

My C270cdi sounds like a black cab from the out side (123k miles) and the C220cdi sounds the same (240k miles).

 

[whitenemesis]

The 270 is not the most refined MB diesel. Mine sounds clattery when cold, but has a wonderful growl on acceleration

Both these seem to disappear when warm. The growl is there but slightly more muted

 

[sixpack]

Noisy 270cdi

Hi Wirral Guy
Agree with others, it is noisy when cold, not even that quiet when hot. Mine seemed to take ages to warm up but a new thermostat helped, part was about £27 from dealer.

Peter

 

[ALFIEBEARD]

Hi my E270 CDI is not really noisy more gruff(if thats a word) but what a nice engine when you boot it it growls like a V8 and when hot on the motorway has a muted thrum about it, these are brilliant engines and are pretty powerfull for a diesel, and mine is very economical for a 2.7ltr around 45mpg cant grumble at that especially in a 140mph+ car. I think these engines are as good as any Mercedes have produced, and if correctly serviced can cover huge mileages.

hope this helps, my opinion is worth what you paid for it:lol:.

Regards
Alfie B

 

[Rappey69]

mine has 257,000 and it purrs (for a diesel) Its not that clattery when cold but is pretty quiet outside when warm.

 

[Wirral_guy]

Thanks all for your observations. It's not that it sounds wrong, just a bit noisy so I'll put it down to the design.

Dave

 

[Rory]

Has it had the oil changed recently? What viscosity oil is in it? A 0-30W will sound quieter on startup than a 10-30 or 40W. I reckon mine is quieter if the oil level is kept well up - but DON'T over fill it.

Also, what kind of diesel do you use? A higher cetane rating diesel, or adding something like Millers Diesel Power Plus might help. Some people swear by Millers but I have to say it doesn't seem to make any noticeable in difference in mine, but it's only done 42K.

Bizzarely, I reckon mine runs best, and it returns its best economy figures, on Sainsburys's City Diesel. It's 5% biofuel and I thought maybe it's extra oily or something. Yet I've seen plenty of comments from people saying their economy went down (sometimes a lot) when using this fuel.

 

[Wirral_guy]

Has it had the oil changed recently? What viscosity oil is in it. A 0-30W will sound quieter on startup than a 10-30 or 40W. I reckon mine is quieter if the oil level is kept well up - but DON'T over fill it.

Also, what kind of diesel do you use? A higher cetane rating diesel, or adding something like Millers Diesel Power Plus might help. Some people swear by Millers but I have to say it doesn't seem to make any noticeable in difference in mine, but it's only done 42K.

Bizzarely, I reckon mine runs best, and it returns its best economy figures, on Sainsburys's City Diesel. It's 5% biofuel and I thought maybe it's extra oily or something. Yet I've seen plenty of comments from people saying their economy went down (sometimes a lot) when using this fuel.

Rory

Oil was changed about 2 months ago but am not sure of the quality as the car dealer did it so it may be poor quality.

I have already started using Millers SP4 but I didn't notice a change so am treating it as clean up solution rather than any other benefits and it is waayyy too expensive for constant use. I normally use Shell normal diesel - after the Millers has finished I might try some Shell premium diesel to see if that helps.

I am also looking at maybe sound-proofing the bonnet to see if that helps as I find it a lot less refined than my Volvo D5 engine which was almost petrol like in the sound. The CLK has a lovely growl when you boot it but awfully taxi like from cold.

Dave

 

[Rappey69]

At constant 35 mph i cannot hear my engine. Would have thought yours would be the same.
It will be noisy when hard accelerating though.
have you just come from a petrol car or something?
I drove a 2 year old audi A6 diesel the other day and its not as quiet as the merc.
A mobile mechanic friend of mine remarked how quiet my car is and even said hes been in petrols that are noisier !
When i test drove my car i remember saying to the conman- sorry seller that i was surprised how noisy it was for a merc but now think its quiet?
We will be getting Db meters next and comparing notes. lol.

 

[HelpThisDude]

The 270 is not the most refined MB diesel. Mine sounds clattery when cold, but has a wonderful growl on acceleration

Both these seem to disappear when warm. The growl is there but slightly more muted

I do love the growl Not that mine is allowed of the leed much...

 

[turbopete]

if you think a 270 growls when you boot it, you should hear my old 300 turbo! best noise ive heard from a diesel! although ive not had a go with a 320 cdi yet though!

 

[tony2311]

Mine sounds like a taxi on accelaration. but very quiet cruising shame i drive in town/a roads mostly

 

[Google44]

Just out of interest, what sort of miles you get for £50 out of yours? I can hardly get 26 mpg with 80% drive on open road.

 

[tony2311]

i get 400 miles to a tank. works out at around 35mpg which i though was bad but 26mpg on a c270 there must be something not right

 

[whitenemesis]

I average 43mpg over the last 18,000mls

In town around 38-42mpg

A good motorway run 50-60mpg

 

[Wirral_guy]

I've done about 2000 miles since I got it and the computer is telling me just a shade under 40 (39.6). This has been a good mixture of motorway and urban driving with a fair bit of, err, ahem, testing under acceleration . In that mileage is one long journey of 400 miles which hit 51mpg that might skew the figures a bit but am hoping to maintain around the 40 mark. Diesel used is Shell standard.

If you're only on 26mpg then you either drive flat out everywhere or there is something amiss!

Dave

 

[Rory]

I average 43mpg over the last 18,000mls

In town around 38-42mpg

A good motorway run 50-60mpg

Mine doesn't do "town" but 38-42 is about what I'd see on urban use, depending on how long the journey is.

I mainly use it for long steady motorway runs cruising at 70-75MPH but the best it'll display is 52-53MPG. Once it's settled, pushing up a hill will decrease the figure .1 or .2 and then it will come back it there's a downslope on the other side.

The cars lifetime average is 48.something so you can see how its use is skewed.

All a little meaningless as I've no idea how accurate the computer is!!

 

[Google44]

I apologize for this. As soon as I’ve seen cdi270 thought it is ML – same as mine. Still the same engine tho