E87 120 120d Poor MPG
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Thread: 120d Poor MPG

  1. #1
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    120d Poor MPG

    Having recently purchased a high mileage (180k) 120d sport for the wife, I'm more than a little disappointed in the mpg its returning at the moment..............around 36mpg if the computer is accurate.

    What do others get on similar models?

    I've run diesels for years and never had an mpg problem so I'm a little stuck for what to look at if this mpg turns out to be lower than others get. If it can't be improved wifey is going to be upset to say the least - her Golf always returned over 50mpg and over 45mpg with my right foot in control.

    Ok so its 163bhp against the Golf's 105bhp but driven reasonably I'd expect at least 40mpg. I had a new 150hp 320d in 2004 and that always returned over 45mpg - regularly north of 50mpg on a run. Plenty of people seem to achieve over 40bhp out of old M51 6 cylinder diesel engined cars so I'd expect more out of this.

    There could be wear in the pump or injectors at this mileage but it had no problems passing its MOT and doesn't smell or smoke unduly. I'm thinking EGR valve/inlet manifold gummed up? Anyone done one? First port of call though is going to be the air filter - I haven't looked but I've read that they are not easy to do. Seeing how the rest of the car's maintenance (lack of) has been carried out, if its true they are bad to do, I wouldn't be surprised to see a very black, sooty filter.
    Last edited by Phil; 09-11-2013 at 23:16.

  2. #2
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    Certainly servicing it can only help - changing the filters and having a look at the EGR valve etc. is a good starting point.

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    Faulty thermostats can kill fuel economy on dervs so I'd check the coolant temp via the OBC too.

  4. #4
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    Jeez I've just noticed, the car has no temp gauge, that is bollocks! A temp gauge is probably the most important instrument on a car. No doubt a warning light comes on if it gets too hot but I'd prefer to know something's wrong before then.

    So, no spare wheel, no temp gauge, well done BMW really progressive!

    Seriously, the fact that there isn't even a place to put a spare wheel if you want to buy your own is making me consider whether or not we should keep this car. Suppose I'm on the way to the airport and get a flat, one that's too bad to drive on - even on run flats. Call out the RAC? Chances are I'd miss my flight. I don't see run flat technology or its predecessor , space saver wheels as modern technology. I believe this is just a way for manufacturers to save a few pounds per car. 5 x 1 million cars =...............................

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    Quote Originally Posted by Phil View Post
    Jeez I've just noticed, the car has no temp gauge, that is bollocks! A temp gauge is probably the most important instrument on a car. No doubt a warning light comes on if it gets too hot but I'd prefer to know something's wrong before then.

    So, no spare wheel, no temp gauge, well done BMW really progressive!

    Seriously, the fact that there isn't even a place to put a spare wheel if you want to buy your own is making me consider whether or not we should keep this car. Suppose I'm on the way to the airport and get a flat, one that's too bad to drive on - even on run flats. Call out the RAC? Chances are I'd miss my flight. I don't see run flat technology or its predecessor , space saver wheels as modern technology. I believe this is just a way for manufacturers to save a few pounds per car. 5 x 1 million cars =...............................
    Could't agree with you more TBH Phil, my E91 doesn't even have a dipstick..... You only know that you need to add oil when it's on the minimum and flags up to add 1l, if you add it sooner on the "gauge" it doesn't register??? What's that all about? I like to maintain my cars and keep them on the correct level, checking them before I go on a run. Not exactly forward progress..

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    I agree with the no temp gauge, really stupid move that and agree with the no spare. As for the MPG your getting that does seem really low, I have a lead foot and still get a good 45mpg out of my 120D mine is lower mileage (65k) so there may be some problem with it or its just down to it being higher mileage and being abit worn out?
    2008 E81 120D


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    I think it would be a good idea to see if there are any fault codes that need looking at, then check your thermostat, egr, air filter and give it an oil change.

  8. #8

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    Buy some tyre sealant aerosols, I got a pack of 4 from Ebay. I have used them before and they will get you to a garage for repair.

  9. #9
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    Nope, run flats binned and although I hate it, a proper spare wheel in the boot. Sealant ain't gonna fix a kerb spit.

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