Well, I don't know what other websites call what, or why, so I can't answer that...
As for the engines, I have never heard of the N62TU anything... I know of the N62, but I don't know what that TU is/stands for.
As far as I know, the
are all available in US markets, but the B48 is the only one that comes in a 550i. Though the others may fit.
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The word 'politics' is derived from the word 'poly', meaning 'many', and the word 'ticks', meaning 'blood sucking parasites'.