I have a '22 CX-5 Turbo, and bought the dealer service contract. They change the oil every 6 months, but say it only needs conventional oil. I wrote to Mazda Customer Experience about this. They agreed that synthetic oil is superior, and said I should contact the dealer. My feeling is if the dealer really cared about doing what's best for their customer's car, they would use synthetic oil. Instead they do what is cheaper for them. I am going to cancel the remainder of the contract and demand partial refund. Anyone else have to put up with poor dealer service?