no free first oil change? Mazda specs 5000 mile OCIs. My dealer put Mobil One in.
I was under the impresion that Indemisu was the Mazda oil of choice.
My 2 cents
It likely depends on the dealer.
Recently Mazda chose Idemitsu to be their sole supplier of synthetic oil. I believe that also includes supplying MTMUS which would be a nice deal for Idemitsu.
My dealer used to use Castrol but Idemitsu was also stocked. Now they use Idemitsu exclusively.