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Originally Posted by condor  A 540 is a 5 series, named by BMW, as per their nomenclature. The '540' does not have to mean anything more than what BMW intends it to be. BMW's naming is not on the lines of what this thread started off on ... |
That's how BMW nomenclature works. A 325 would mean a 3 Series sporting a 2.5L engine, a 540 would be a 5 Series sporting a 4.0L engine. It was sort of similar for Mercedes too, a C200K would mean a C-Klasse with a 2.0L supercharged engine.
But not anymore, it's all gone horribly wrong somewhere.