On my 2014 there were a bunch of options I didn’t like so I took it to the dealer and they changed them all, free of charge.

It’s made in a facility that’s only about 2 years old (with most of the workers there being new to car manufacturing) which is half-run by Mazda.

Burned oil means residue so change the oil and the filter.

Leaking oil means you can just change the filter at regular intervals and then change the oil less frequently.