I think that the Mazda 5 would have the old Ford Duratec engine, wouldn't it?Our 2013 Mazda 6 and 2015 Mazda 5 both with the similar/same 2.5 engine take 5.4 quarts to get to the full hole on the stick.
Not sure whether a '13 Mazda 6 would be running a SkyActiv engine or the same Duratec as the 5.
The OP's CX-5 engine would definitely be Mazda's SkyActiv-G engine.