Well, hmmmm... have no idea how long the N55 takes, yet have heard the N20 takes about 3 to 4 hours. We just discovered the wife's 2013 X1 has this problem during oil change at dealership last week. BMW of Sarasota is fixing her N20 for free under recall
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Enjoy the Drive,
Steven
2014 435i M-Opt, M LSD, Dinan CAI/IC/BTurbo/Stage 4, ER TIC/CP, GFB DV+, Fabspeed HJS cat DP & Mich PS4S.