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Originally Posted by Rehaan  However, dont assume that the BMW 540 is a 5 series with a 4.0L (its a 4.4L), or the same for some Mercedes models, and a bunch of other manufacturers with strange labeling schemes etc etc... |
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 ...