Honestly I just use whatever BMW certified oil I can find at a good price. Used Motul this time, had Castrol before that. Bosch oil filter.
I personally do an old and filter every 6-7000 km. I do it so frequently because, 1) I do it myself, so cost is down and I make sure the job is done right. 2) the sky active engines are known for carbon buildup, so more frequent oil changes should help. 3) Longevity, I want to see 300,000 or more on the dash one day.
People like me on the other hand are going for synthetic oil and Mazda OEM filters but still need to get an oil change at 5000 miles.
An oil change with decent full synthetic is 30-40$ for 5 quarts + OEM filter for another 5-10$. It's relatively cheap to do every 6-8 months to know it always has decent oil, and no problems should arise.
I'd go with the OEM Mazda Oil Filters but any high quality synthetic 0w20 will work fine.
Castrol 5w-30-M with Bosch filter.
[The filter was this](https://m.autodoc.co.uk/bosch/11156545)
You could do another oil and filter change to see if it was that or if the oil was just a coincidence.
OEM Mahle/Mann are best. Next best is the higher end Bosch filters.
The Miata is pretty easy to work on. But ironically, one of the simplest jobs is a major PITA, changing the oil filter The thing is buried underneath the intake manifold.
Bosch filters are almost as bad a FRAM now.
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