I noticed on my first oil change that when I filled the crankcase according to the amount instructed in the manual it only registered between the min and max marks on the dipstick so I had contacted Mazda Canada and asked how much oil for my 2019 CX-5 2.5 L NA engine. Their reply was " Thank you for contacting Mazda Canada. In response to your inquiry, the oil level, when inspected hot, should read half way between MIN and MAX. The vehicle comes from the factory with 0W-20 oil. As for the additive content in our branded oil, we can not provide specifications as this is a proprietary formula.".
I suspect that Mazda prefers the oil level be between the min and max marks to allow for engine oil dilution with gasoline. Once the oil level exceeds the max mark it is deemed to have excess fuel in the oil and must be replaced. I've attached a Mazda December 2017 bulletin on engine oil dilution that explains how direct injection engines experience engine oil dilution under certain conditions.
Previously I had a 2015 Kia Sportage. I live in a northern climate and drive a number of short trips. I'm old school, so I check my oil regularly. When I noticed the engine oil level increasing due to gasoline getting into the oil I went to the Kia dealer and asked what Kia's recommendation was for oil dilution and they told me they never heard of this problem and they would have to do the next 3 oil changes to verify my concern. They didn't want to record the level at specific intervals as I had suggested so I agreed and left the vehicle with them. They later called and instructed me to pick up my vehicle without doing an oil change and washed their hands of addressing my concern even though the vehicle was still under warranty. I contacted Kia Canada and complained of my treatment by the dealer and asked for technical assistance regarding the oil dilution experience. Their response was that they relied on their dealers for technical issues and couldn't help me. They told me if I wasn't satisfied go to a different dealer. So I did some internet research and discovered the Mazda bulletin and that engine oil dilution is a common problem for direction injection gasoline engines. Mazda's bulletin was what prompted me to investigate Mazda and that is why last year I kicked Kia to the curb and bought my 2019 CX-5.