The ADBV (anti drain back valve) is either a silicone or rubber gasket inside top area of the oil filter. I remember reading somewhere that Mazda said it has to do with flow and that's why WIX designed their filters for these engines under that specification while most others didn't. Pictured here shows an orange ADBV. They can be in different colors and materials like silicone, nitrile rubber, orange, black, blue, etc. The OEM filters do not have these.
In my previous cars I had no issues with filters mounted vertical with ADBV. Now, some cars were reported to have issues with those valves in the oil filter but rarely ever do you see issues. There was a gentleman that had a FRAM Ultra oil filter in his Mazda 6 and broke down because the ADBV got sucked into the oil pump. He sent the filter back to FRAM for analysis and they concluded that his filter failed and they refunded him for engine repair/replacement which was quick and efficient response. I'm sure many don't have a problem running these filters in their non turbo Skyactiv engines but I was just curious to see if there was concrete knowledge for this design on these engines to use particular filters. Too many default responses on forums like these to just use OEM filters without reasoning. Almost like a parent telling their child, "because I said so".
For me, most of the time I think it's because manufacturers have contracts with certain companies so they push their products hard. Like how Mazda pushes Castrol oil at their dealerships here in the US when you can use any oil that meets their specification in the manual.
