Cheap glow plugs are bad news, especially it seems in these engines. They either don't heat up sufficiently or die very quickly. Stick to Delphi, NGK or Bosch.
If you pull a cheap plug out, it will probably break as your doing it... so your in a whole heap of hurt, and cursing why you didn't spend the extra £ instead of 1/2 a day getting the crap ones out, get good makes, it pays in the end
thanks all stick to ngk think/also supermarket diesel crap in cold weather .but esso .bp ect .just touch the key /perfect/no smoke no missing no craking and it sounds sweet.i know its been covered,but any one wi poor start and running start wi quality diesel .
doint be sorry .might be something they add and (tesco ect) doint/mines just seems to start better and have more power.even more so in winter.thats when i buy the good stuff.might be supermarket stuff waxes in winter no detergent stuff.