Quote:
Originally Posted by nice1guv
... Glow plugs only affect starting, so nothing in that one.
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I'm pretty sure that the glow plugs
are used during running, if the cylinder temps drop too much, as least on later cars/engine - but likely not on our older M57/M57N versions - more likely on the variants with a DPF, i.e. E70 with the M57N2 etc.
Keeping the cylinders up to full temps helps with emissions, something BMW worked hard to bring down on the E70 and newer.