1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Fuel consumption UP after oil change TDi

Discussion in 'A4/S4 forum(B5 Chassis)' started by TeKnodriver, Mar 13, 2014.

  1. TeKnodriver
    Offline

    TeKnodriver Biodiesel Purrrr

    Joined:
    Jun 5, 2011
    Messages:
    151
    Likes Received:
    2
    Hi,
    changed engine oil about a month ago using 5-40 fully synth,
    before I had 10-40 semi synth
    [TDi AFN 110]

    engine sounds smoother but my fuel consumption seems up almost 20%

    ideas -
    is the oil pump worn and not circulating the oil properly?
    bad choice of oil?
    disturbed boost pipes during change causing overfuelling?

    any input appreciated
    Thanks!
    #1
  2. aragorn
    Offline

    aragorn "Stick a V8 in it!" Staff Member Moderator

    Joined:
    Jan 30, 2008
    Messages:
    15,529
    Likes Received:
    301
    unless the old oil was utterly shagged, i wouldnt expect an oil change to improve or reduce fuel consumption.

    There will be some other cause.

    check the leakback pipes on the injectors arent leaking.
    #2
  3. TeKnodriver
    Offline

    TeKnodriver Biodiesel Purrrr

    Joined:
    Jun 5, 2011
    Messages:
    151
    Likes Received:
    2
    pipes between injectors sound and dry -
    changed them about a year ago.

    My thought is boost leak from disturbed IC or boost pipe
    #3

Share This Page