Quote:
Originally Posted by 240Joe
I've had 3 MB diesels and put over 500kmiles total on them. I've never had a bad glow plug.
240Joe
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Unlike spark plugs, it depends on how things are done. Some have GPs that heat up and continue to heat up for a bit after starting. IIRC, older diesels don't do that. Also it would depend on how you run the car. If you run it for 24 hrs at a time, you might not burn out the plugs as often as if you run it "start-stop" all day long.