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

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I would assume they are tested before shipment. This would cause the colorization on the tip. – Pᴀᴜʟsᴛᴇʀ2 Dec 27 '13 at 15:23
Yes, this is what I thought, but I wasn't sure... – Skippy Fastol Dec 27 '13 at 23:19
up vote 3 down vote accepted

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

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Sublime contribution. Thanks ! – Skippy Fastol Dec 30 '13 at 2:00

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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Thank you so much for this wise trick – Skippy Fastol Dec 27 '13 at 23:19

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