If I were you I would keep all the paperwork of Mazda saying it’s all ok plus also make Mazda customer service aware that your vin falls in the suspect numbers and in case of failure that your service record is up to date plus check oil yourself at least every 1000 miles and intermediate oil and filter change as I do or every 6 months if you don’t do the miles and if the oil level creeps up which it shouldn’t changing it that frequent but if it does oil change at that point but if its caused by strainer blockage that could be the cam failing ? By the way when Mazda refill after oil change they only fill to within an 1/8 inch below the full mark as per Mazda Japan instructions. Plus I would extend your warranty as repairs and parts are expensive especially if that cam is faulty hope this helps.
Cheers Steve