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Is the color of the heated part normal for 4 glow plugs that are brand new ... ?

  • I would assume they are tested before shipment. This would cause the colorization on the tip. Commented Dec 27, 2013 at 15:23
  • Yes, this is what I thought, but I wasn't sure... Commented Dec 27, 2013 at 23:19

2 Answers 2


Yes, depending on the specific glow plug, this coloring is normal.

Here is a link to a new BERU plug that has the same coloring in the image:


Here is a nice shot of a used glow plug:

used plug


Be careful if you decide to 'test' your new glow plugs.

The lot of glow plugs start off with 12 volts, but then after 2 seconds the voltage is dropped by their ECU to 4 volts operating voltage. If you keep a supply of 12 volts to the glow plug they will burn out and become useless.


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