Fuel Quality - Diesel...

Discussion in 'General Discussion' started by dubsR33, Mar 25, 2014.

  1. dubsR33

    dubsR33 Hardcore MB Enthusiast

    Messages:
    227
    Joined:
    Nov 11, 2013
    Location:
    Bristol
    Car:
    CLK 320 & 515bhp R33
    On my other forum the topic of petrol quality from different petrol suppliers is often spoken of as the mass majority of us on there are mapped to a certain brand of super unleaded like Shell, Esso, Texaco, tesco etc etc

    Anyway, as this is my first Diesel car - I've never heard much about the same but with diesel if you get me?

    I only mention this as up until now I've been using the same garage in Gloucester every time to fill up my CLK 320CDI, its a random own brand kinda garage - because its a penny cheaper than anywhere in Bristol... (I live in Bristol and work in Gloucester) With steady driving i average from tank to tank about 420-440 miles per tank.

    Now is this diesel cheaper for a reason? i only say this because i had to use texaco petrol station in Bristol the other day and filled to the top and drove in the exact same manner and got almost 500 miles from the tank!! So would bog standard Texaco diesel be a better than this other garage?

    i thought diesel was just diesel...

    :dk:
    Cheers
     
  2. ItalianTuneUp

    ItalianTuneUp Hardcore MB Enthusiast

    Messages:
    1,357
    Joined:
    Nov 20, 2013
    Location:
    Hampshire
    Car:
    S320CDI
    I shall watch this thread keenly, as I have often wondered about diesel quality/price differences.
     
  3. cinek

    cinek Hardcore MB Enthusiast

    Messages:
    1,152
    Joined:
    Feb 15, 2013
    Location:
    Herts
    Car:
    MB W204 , BMW F10, GSXR LZ3
    Some claim that V power fuel does make a noticeable difference.
    I have tried it on number of occasions and truth be told, I did get some more miles out of the tank.

    However, I did want the car to perform well, or shall I say, I wanted the car to perform better than usual. That in turn made me drive it more consciously, reducing harsh accelerating and unnecessary braking, which could have been the real factor behind improved economy.

    It is normal diesel that goes in my cars and normal petrol that I fill the bike with. Never had an issue with either.

    I do however use Shell fuels 99% of a time and keep well away from supermarket garages.
     
  4. OP
    OP
    dubsR33

    dubsR33 Hardcore MB Enthusiast

    Messages:
    227
    Joined:
    Nov 11, 2013
    Location:
    Bristol
    Car:
    CLK 320 & 515bhp R33
    its worth talking about thats for sure.

    I'm just wondering if the 'normal' diesel, not the diesel plus etc is better from a more well known branded supplier rather than the one off unknown places....
     
  5. cinek

    cinek Hardcore MB Enthusiast

    Messages:
    1,152
    Joined:
    Feb 15, 2013
    Location:
    Herts
    Car:
    MB W204 , BMW F10, GSXR LZ3
    Yes and yes again.
     
  6. ItalianTuneUp

    ItalianTuneUp Hardcore MB Enthusiast

    Messages:
    1,357
    Joined:
    Nov 20, 2013
    Location:
    Hampshire
    Car:
    S320CDI
    Sorry if this is a stupid question, but why?

    Anecdotally, I have heard some people say that supermarket diesel is full of crap, but is that true? Has there been a scientific analysis to prove this, I wonder?

    I generally use Asda diesel, so should I avoid filling up there?

    So far, I've not noticed any strange issues from using it.
     
    Last edited: Mar 25, 2014
  7. chrisjfinlay

    chrisjfinlay Active Member

    Messages:
    77
    Joined:
    Mar 13, 2014
    Car:
    s320 cdi (W221)
    Here on the Isle of Man, we have once choice for diesel... All the garages are run by one company...
     
  8. OP
    OP
    dubsR33

    dubsR33 Hardcore MB Enthusiast

    Messages:
    227
    Joined:
    Nov 11, 2013
    Location:
    Bristol
    Car:
    CLK 320 & 515bhp R33
    have you compared a tank to tank mpg from asda diesel compared to another petrol station etc?
     
  9. ItalianTuneUp

    ItalianTuneUp Hardcore MB Enthusiast

    Messages:
    1,357
    Joined:
    Nov 20, 2013
    Location:
    Hampshire
    Car:
    S320CDI
    No I haven't done that. I expect if I paid a 10p/15p premium per litre on shell v power, or equivalent, I may see improved mpg, but is it worth it? That's almost a £15 premium per tank on my car.

    It seems likely the shell v power cleaning additives would be beneficial, certainly not harmful, but hopefully the fact I mostly do motorway miles keeps engine etc clean anyway, from the Italian tune up effect :)
     
    Last edited: Mar 25, 2014
  10. Stratman

    Stratman Hardcore MB Enthusiast

    Messages:
    4,096
    Joined:
    Jun 15, 2003
    Location:
    Sunbury
    Car:
    W203 C200 CDI '04Estate
    Is there a secret refinery somewhere marked "Supermarket crap"?

    If not, I'd hazard that supermarket fuel comes from the same refineries as 'own brands'. It might lack one or two proprietary additives, but by and large it won't be too different.
     
    2 people like this.
  11. Dieselman

    Dieselman Banned

    Messages:
    34,206
    Joined:
    Jul 13, 2003
    Car:
    Peugeot 403 Convertible
    I don't notice any difference in mpg from different brands, but do find V-Power gives LESS mpg and costs more.
     
    2 people like this.
  12. ItalianTuneUp

    ItalianTuneUp Hardcore MB Enthusiast

    Messages:
    1,357
    Joined:
    Nov 20, 2013
    Location:
    Hampshire
    Car:
    S320CDI
    I expect you're right. Is it possible to find out who the supermarkets buy their diesel from? I can't believe we're the first ones to question this.
     
  13. OP
    OP
    dubsR33

    dubsR33 Hardcore MB Enthusiast

    Messages:
    227
    Joined:
    Nov 11, 2013
    Location:
    Bristol
    Car:
    CLK 320 & 515bhp R33
    the cheap petrol station in Gloucester that i have been using is called "Pace" - never seen or heard of it before working here..
     
  14. Dieselman

    Dieselman Banned

    Messages:
    34,206
    Joined:
    Jul 13, 2003
    Car:
    Peugeot 403 Convertible
    Pace fuels are a regional distributor. No problem with that, but they are possibly skimping on additives.

    Perform more MPG checks before condemning it as a single tank isn't enough to go by, due to possible filling errors.

    You could continue to use cheaper fuel and add your own additive.
     
  15. ItalianTuneUp

    ItalianTuneUp Hardcore MB Enthusiast

    Messages:
    1,357
    Joined:
    Nov 20, 2013
    Location:
    Hampshire
    Car:
    S320CDI
    Very interesting. Anecdotally, iirc, I seem to recall that others claim higher mpg with v power. Maybe it depends on other factors too?
     
  16. cinek

    cinek Hardcore MB Enthusiast

    Messages:
    1,152
    Joined:
    Feb 15, 2013
    Location:
    Herts
    Car:
    MB W204 , BMW F10, GSXR LZ3
    Because I recall number of stories involving water mixed with fuel causing untold of troubles for those who happen to fill up that day.

    If I am not mistaken, it included Morrison more than once, Asda and I remember few years ago our local Tesco garage had some water contamination issues too.
     
  17. ItalianTuneUp

    ItalianTuneUp Hardcore MB Enthusiast

    Messages:
    1,357
    Joined:
    Nov 20, 2013
    Location:
    Hampshire
    Car:
    S320CDI
    Add which additives DM? I thought MB don't recommend additives?
     
  18. ItalianTuneUp

    ItalianTuneUp Hardcore MB Enthusiast

    Messages:
    1,357
    Joined:
    Nov 20, 2013
    Location:
    Hampshire
    Car:
    S320CDI
    That's interesting. I wonder why non-supermarket diesel would not suffer the same water contamination as well?

    Maybe more 'cheap skates' who use supermarket fuel let the fuel run right down before refilling? On the petrol thread, water condensation in the tank often occurred with emptier tanks, iirc. Purely a wild guess, but it would be good to know the reality here.
     
    Last edited: Mar 25, 2014
  19. Dieselman

    Dieselman Banned

    Messages:
    34,206
    Joined:
    Jul 13, 2003
    Car:
    Peugeot 403 Convertible
    Not recommending additives, then using one at service time seems out of kilter, but that's what Mercedes do.

    The don't recommend them as a catch all if someone adds snake oil and it goes bang.

    I find Millers to be good and cost effective.
     
    2 people like this.
  20. OP
    OP
    dubsR33

    dubsR33 Hardcore MB Enthusiast

    Messages:
    227
    Joined:
    Nov 11, 2013
    Location:
    Bristol
    Car:
    CLK 320 & 515bhp R33
    I've been using the Pace petrol station since November and the tank on tank has been pretty consistent, I'm on my 2nd tank of texaco now so i will see what happens this time...
     

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.