With ongoing advancements Mazda has announced for all 2017 models the new oil change/scheduled service intervals will be every 8,000 kms or 6 months.
This includes the 2016 CX-9.
All other previous model years will still be on the 4 months or 8,000 kms schedule.
This change will help those who don't do a lot of miles on their vehicle.
Cheers!