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Originally Posted by StephenOrd
The manual for my 330d (UK) warns that when it is very cold (below freezing) there may be a delay between you pressing Start and the engine turning over to allow for the glow plugs to come up to temperature.
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My manual also says "may" - this would be the case where you try to start the car before they have finished warming...
I think they are needed when it's about 5-10 degree's C...but that would only take a few (3ish) seconds. Below freezing, it could take up to 10 seconds.
It's all automated, if they are not warm enough - the car will delay it's start - so I don't even think about it :P