Just purchased a another mazda cx 5 2017 grand touring nice vehicle. I asked service manager about oil changes. Mazda says every 6 months or 5 k on the miles. Dealer charge is $ 70.00 per change. The 14 we traded only had 22 k so not sure how to play their game. After the first change I can do the others. They want me to use their oil even if I do the change. Let me know your thoughts? Thank you jz.