Q5 lease terms in NNJ


I’m negotiating an Audi q5 premium w/ convenience or premium plus in Northern NJ. 15,000 miles and 36 months with everything rolled in. Dealers are pushing me to a 39 month lease. Is there a reason for this? What are the pros and cons? My lowest offer so far has been 580 per month at 39 months with the same terms as above (15000 / everything rolled in, just first month due at signing). I currently have a lease on a q5 which I’ll be turning in and will be taking advantage of the 2 month pull ahead program.

Thanks for the help!