QUOTE(echoesian @ Jul 9 2011, 09:27 PM)
So in terms of save fuel, N52 vs M54 which one is better?
Technically the n52 claims it has better fuel efficiency but in malaysia apparently the n52 has a bad fuel efficiency compared to the m54 according to people. I suggest you do more research on that to be sure
And if the next question your gonna ask is "which has better performance"
here's your answer the n52

Added on July 9, 2011, 10:30 pmQUOTE(tishaban @ Jul 9 2011, 10:24 PM)
I don't get it, you plan to buy a 3.0l engine and you want to save fuel? Unfortunately 3.0l engine with big heavy BMWs will mean expensive fuel bills no matter what

Also don't forget that the M54 is an older engine so again you're automatically looking at higher maintenance (although not necessarily higher cost).
He's talking about e60 525i which only ONCE came with a n53b30, the rest of the time the 525i came with a 2500cc that is m54 and n52.
Chances of him getting the one with n53b30 are pretty slim.
BTW i'm not sure about this but if im not mistaken the newer magnesiums engines have to be oil serviced more regularly then the m54's
This post has been edited by Johan-N: Jul 9 2011, 10:30 PM