Auckland took 18 points from the encounter to sit 10 clear of second-placed Central Districts, whose match with Otago petered out to a predictable draw on the final day.
Napier's Nelson Park treated the batsmen well throughout the four days and, after the hosts racked up 650-8 in their first innings, only a final-day collapse from Otago would have provided a result. But Neil Broom ensured that never eventuated, compiling his 16th first-class century to finish unbeaten on 131 as the visitors ended the match on 265-3.
It was a similar story in Hamilton, although Wellington had to work significantly harder for their share of the spoils against New Zealand's test pace attack.
After Trent Boult (5-97) ripped through the visitors' lower order to leave them precariously placed at 328-9, Northern Districts looked likely to be set an intriguing chase on the last afternoon.
But Dane Hutchinson (48no) and Brent Arnel (32no) then blunted Boult and Tim Southee, putting on 81 for the final wicket before the umpires decided to draw stumps.