Initial thoughts of an E320CDI test drive

brandwooddixon

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Hi all, just thought that I'd share my test drive experiences with you.
The kind people at Wolverhampton Mercedes have given me 24 hours with a new E320CDI Estate Sport with tiptronic. 1500miles on the clock.

Having just completed a 200 mile round trip of mostly fast motorway traffic with about 30 miles cross country work and 20 miles town driving here are my conclusions.

Now please bear in mind that these are all based on comparisons between this particular car and my own, old E430 Avantgarde.

On the move the engine is surprisingly quiet, both from the inside and outside (as attested when the dealer brought the car too me).

On idle, it's definitely a diesel although its still pretty quiet and certainly not as loud as some.

Ride quality is on par with the Avantgarde suspension of old. The 18" wheels feel some smaller bumps which you might not notice with 16" rims, but not bad enough to put me off. Certainly the handling on the twisty stuff is a bit more direct and with less lean than my car.

Mid range overtaking acceleration is prodigious and overtaking opportunities at 50-60 abound., but I found a noticeable lack of power below 1600 rpm, which suddenly becomes a kick in the back as the turbo cuts in. Preselection of a lower gear made this far better, especially when overtaking from 30 - 40mph or slowing for a roundabout and accelerating away.

The brakes can be a little sharp at first, but are certainly an advancement in power over earlier systems, although to my mind it was alittle too easy to trigger the brake assist.

Those Xenon beams are a definite must have, their light is far superior to halogen bulbs.

I did note that partial electric seats are a pain in the arse and manually adjusting the steering wheel is far more difficult than it should be. Full electric seats with memory are a must.

The passenger door mirror doesn't dip on reverse selection, although this my just be part of the memory pack, which this particular vehicle doesn't have.

A little thing I know, but the parking brake release is made of an inferior plastic than of old and has sharp molding lines present just where you grasp it. Generally all moving plastic parts seemed a little flimsier.

The centre storage box is no good for chocolate anymore, not being cooled by the airconditioning, although this may be due to the phone prewiring.

The partronic was interesting, but I'm not sure whether it's a necessity on an estate car, although I can see it being useful for guaging the back of a saloon.

The tiptronic gearbox function struck me as being superfluous, as I found the "flappy paddles" to be in the wrong place for where I grip the steering wheel, the gearbox will still override your selection in certain circumstances and you can achieve much the same by moving the gear selection lever. (Incidently it's nice to see that MB couldn't be bothered to change anything for the British market - the markings for the gear selector and the gearbox mode switch are on the wrong side of the console.)

Now my aim was to compare this car on a journey that I do regularly in order to see if comfort and economy were better or worse. Comfort wise there's no worries, but I was surprised at the economy, or lack of. I drove at the same speeds and in the same manner to which I normally do. Plod baiting for sure but here's the rub.

I normally manage around 27 mpg with my big old V8 petrol lump over this journey and driving in this style, but this CDI only managed 33 mpg according to the trip computer. That's barely 20% better, with fuel that's 10% more expensive.

So is the 10% saving worth it? Well I don't know. I suppose that the potential for fuel saving is larger with the diesel, especially if I slowed down a bit than with my V8. I've heard people say that they've managed over 40mpg in one of these, which would put it at a good 35% better than I could manage at the moment.

On a purely financial basis it makes sense, same or better performance, cheaper insurance and cheaper VED (well if compared to say an E500) but having driven through stop start traffic. I found that I began to miss the near absolute silence of my E430 and the quiet diesel "rattle" became more intrusive.

In all it didn't give me the same feel good factor, of being cosseted as I whooshed along. It still felt slightly more utilitarian, just a means of transport as you will rather than something special.

I guess that there's some hard thinking to do ....
 

Rory

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Thanks for that.

The MPG thing is typical in diesel autos if you have a "press on" kind of driving style. You have to drive them differently to petrols and almost let the car drive itself.
 

Alex M Grieve

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How refreshing to hear such a balanced, objective account.

It did to some extent remind me of the Wimpey's laborurer who entered the Olympic high board diving competition but lost marks because the W in Wimpey on his donkey jacket was squint, and he had a blob of mud on his left wellie!

Nevertheless, good to hear the cons as well as the pros - so many opinions concentrate on one view or the other.

I have driven IL6 320 CDIs now for a total of 80,000 miles since 2003 and never managed to reduce the fuel economy as far as in this account, although this report is of the V6 engine.

Diesels are great for overtaking and the torque curve does reflect your experience of performance through the rev range.

A new diesel car is quite "tight" and you would expect improved fuel economy of up to 10% by 20,000 miles plus.

If you were to drive it in the cruise at 2,000 rpm (70 mph) you would also be impressed by the rather better fuel economy, either now or in future.

It will be interesting to hear your further thoughts and your eventual choice. :)
 
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brandwooddixon

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Is it the high speed, or hard acceleration which hits their mpg the hardest?

I know for my car hard acceleration can be the clincher, so perhaps being a little easier on the go pedal would help.

Its probably all to do with torques curves as well. I'm not sure where the E320 CDI has the most torque or how wide its torque band is.

So perhaps I was pressing the go pedal beyond where I needed for fast progress and thus wasting a lot of fuel, but you'd also think that they'd programme the 7-Gtronic to take that into account and not down change.
 

David Nock

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I think I'm right when I recall that the auto box on Mercs is self-learning to the driver's style over several weeks. Mine on the 270 CLK certainly seems different now (4 years later), to what it was on day 1. Either I've got used to it or it has picked up my driving style. Fuel consumption is around 45mpg over 28,000 miles. So 40 mpg from a newer design 320 CDI should be easy.
 

Alex M Grieve

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Is it the high speed, or hard acceleration which hits their mpg the hardest?
Its probably all to do with torques curves as well. I'm not sure where the E320 CDI has the most torque or how wide its torque band is.

Hi Chris,

Both will use more fuel - acceleration will have an effect, but is temporary during the manoeuvre. Cruising speeds have a more predictable and sustained effect on consumption, but as this model is geared for it, 80 mph is about the default - 70 mph is more economical, but it is a balance of journey time, versus cost and in mixed traffic, 80 mph may not get you there much quicker.

The MB site gives info on the characteristics of this engine:

Capacity (cc) 2,987 Arrangement / cylinders / valves V / 6 / 24 Power (hp at rpm) [2] 224 / 3,800 Torque (Nm at rpm) [3] 540 / 1,600–2,400

so a narrow torque curve, but given the high gearing (and the 7 speed box), plenty of scope for good performance, or economical cruising.
 

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If you were to drive it in the cruise at 2,000 rpm (70 mph) you would also be impressed by the rather better fuel economy, either now or in future.

It will be interesting to hear your further thoughts and your eventual choice. :)
~1,600 rpm with the 7 speed box for 70mph. I've been doing some 400+ mile days recently and generally see ~41mpg showing on the trip computer my previous IL6 would show up to 49.5mpg for similar trips however actual fuel consumption on my IL6 worked out at 36.59 mpg average for >109K miles and my V6 is 36.76 mpg for ~40K miles. I blame the Euro IV emissions and the particle filter which burns fuel along with driving it harder as the power is very addictive.
 
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brandwooddixon

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Right, dropped the car off and the dealer promptly took me out in the following:
E320 CDI Sport with tiptronic 07 plate, 33k miles. Indium Silver (grey metallic) anthracite leather, full memory pack(both front seats, mirrors, wheel), cruise, parktronic, quad zone climate, split rear seat, COMAND with navigation, telephone wiring, sports seats, 18 inch alloys, self levelling rear suspension, adaptive Xenon headlights, panoramic sunroof, and self closing boot.
And the price - £25k, with £1k offered for mine!

Food for thought, especially as MB Direct have a car, almost the same spec and age (also 07), but in my preffered colour - black for £27k and only 14k miles.

I'm thinking that they're maybe a litle overpriced still.

I don't know. Either way I'll probably go with a high spec CDI as over a long period of time that 10% fuel saving will add up and if its got some luxuries to cosset me with then that'll help.
 

Alex M Grieve

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And the price - £25k, with £1k offered for mine!

This is very exciting. The dealer is obviously good at what he/she does - right product for you, keen-ish price.

At present, any customer is a bonus for the dealer. Two thoughts. Firstly, if your car will only fetch £1K at trade in, is it worth offering it for private sale and pressing for a discount for cash? Secondly, if your car is in good order, it will not depreciate further and will only ever pay pre 2001 VED. You could therefore keep it, give it to another member of the family (you will certainly get a discount of £1K for cash on the current deal), or just use it for polishing practise.

In any of these scenarios, your "cost to change" will not be any higher, and you retain the asset. ;)
 

malcolm E53 AMG

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Really interesting thread, its nice to hear unbiased reports from people who arn't in the pockets of the manufacters.

The diesel rattle will seem quite loud when your used to the whisper of the V8. I don't really notice my E320CDi being noisy other than in mid winter. You do quickly become used to diesels, I have and I was a real diesel sceptic until the CDi revolution. I find the characteristics of the IL 320CDi power curve very good and don't feel that its flat under 1800rpm. The later V6 might be different but I would have thought that the 7 speed would make it feel brisker.

As regards mpg most of the benefit of a diesel is on start-up where depending on the time of year can mean upto 30% less consumption over the first 2 or 3 miles compared to a petrol engine. Its probably a little known fact that diesel engines do not use extra fuel on start-up.

Pity the new EU4 is choked up by emission regs with no better performance than the older IL6 engine using more BHP to do so. I think I'll hang onto my pre 2001 car due to VED and the fact that the V6 isn't as attractive as I thought.

Thanks for posting, keep up the good work.
 

David Nock

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I think I'm right when I recall that the auto box on Mercs is self-learning to the driver's style over several weeks. Mine on the 270 CLK certainly seems different now (4 years later), to what it was on day 1. Either I've got used to it or it has picked up my driving style. Fuel consumption is around 45mpg over 28,000 miles. So 40 mpg from a newer design 320 CDI should be easy.

So I changed to the CLK 320CDI that I'd been promising myself and I'm getting 38mpg at the 3500 mile mark. It should improve on that a bit more I would hope.
In regard to the 320 CDI V6 engine it's quieter than the old 5 cylinder 270 CLK. BUT I do get a definite Diesel Rattle under moderate loads - picking up speed out of a restricted area for example. It goes away as engine speed picks up and under motorway conditions it's virtually silent. It's also quiet when cold which is surprising.
Does anyone think I should be worried about this definite diesel rattle at about 1200 to 1400 rpm?
 

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before going and parting with your hard earned though Chris, your E430 is a 1998 and theyre only offering £1k? its worth double that under the scrappage scheme which i believe starts officially either today or tomorrow! and as far as im aware, its not optional whether dealers participate or not! could be worth looking into? either that or run it as a second car as if its worth a grand, it cant lose much more!
 

st13phil

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Does anyone think I should be worried about this definite diesel rattle at about 1200 to 1400 rpm?
My W204 C220CDI when new exhibited a noise under load at low revs when cold that I would have sworn was a noisy hydraulic lifter. It only did it for the first couple of miles and only when really cold (i.e ambient temp < 3C) which reinforced my view that it was lubrication related. It also had a slight diesel rattle at about 1200 to 1400 rpm when warm.

I had the dealer sort it out under warranty and all the noises were caused by a couple of the injectors being right on one end of the tolerance band for fuelling and the other two being at the other end of the band. Once the injectors were changed for a better matched set, all was quiet.

Based on your description I would say that your noise may well have a similar cause. If so then it's nothing to be concerned about, but if you can get it attended to under warranty then do so.
 

The Pan Man

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Morning all, there are two remarks that jump out at me both ref noise, firstly traffic when warm and sitting in traffic with the radio at normal volume the noise is hardly noticeable, compared to cold starting in a confined garage. Secondly I have yet to drive a deisel that is quiet under load and I have driven them all 4, 5, 6 and 8 cylinders however, lift off the right boot ever so slightly when you have competed the manouver and with modern deisels it's difficult to distiguish without looking at the rev counter.
E270 CDi Average 40 mpg over 50,000 miles, not too many long journeys but not much sitting in traffic when cold either. As in an earlier post I can greatly improve the MPG by driving like a fuel miser, but rarely do so.
 

David Nock

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My W204 C220CDI when new exhibited a noise under load at low revs when cold that I would have sworn was a noisy hydraulic lifter. It only did it for the first couple of miles and only when really cold (i.e ambient temp < 3C) which reinforced my view that it was lubrication related. It also had a slight diesel rattle at about 1200 to 1400 rpm when warm.

I had the dealer sort it out under warranty and all the noises were caused by a couple of the injectors being right on one end of the tolerance band for fuelling and the other two being at the other end of the band. Once the injectors were changed for a better matched set, all was quiet.

Based on your description I would say that your noise may well have a similar cause. If so then it's nothing to be concerned about, but if you can get it attended to under warranty then do so.

Cheers Phil, you've given me a good train of thought concerning injector matching. The car's only months old so no probs with going in on warranty. I'll probably wait until 1st service since I was undecided whether it was even a problem and the car's totally driveable. It is annoying though and I would like it fixing.
Thanks for that.
 

David Nock

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Update - the dealer changed an injector but he didn't think he'd fixed it - was going to contact MB technical for what to do next.
Anyway, having driven the car about 300 miles since....It's all cured....no rattle at all and a much better feel to driving the car. It pulls smoothly and quitely now as I thought it should.
 


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