The cost of a service, whether that is a Mazda car service or any other make, simply depends on the type of the service and the cost of the parts that need to be replaced. The fact that you need a Mazda car service doesn’t necessarily mean that is any more expensive than a Toyota service for example, not unless the parts are more costly.
Service costs depend mainly on the price of parts
It is fair to say that when you decide to purchase a car that you should take into consideration the cost of parts, not just the parts used in a service, but the cost of the parts you might need replaced over time as well. As you most probably are already aware, European car parts cost more than locally made car parts, so you are always going to pay more for parts if you purchase a European car.
Also, the parts for some makes of cars do cost more than others, simply because the car costs more to buy in the first place and the parts are high precision or high performance parts. So for example, if you compare the cost of a Mazda car service to a top of the line Range Rover or a Porsche, you can expect to pay more for your service for the luxury vehicles.
The more parts that need to be replaced during the service, the greater the price differential. So an equivalent 10,000 km Mazda car service will generally cost less than the same service on a Porsche. When you move into the realm of repairs, of course your costs will sky rocket, depending on the cost of the parts that are required for luxury cars.
If you are concerned about the difference in price between a Mazda car service and a Toyota, then there is not much in it and you should decide on your purchase based on your needs, rather than any disparities in service costs.
An additional factor you need to consider when you are thinking about costs is that different dealerships and auto shops will charge different fees. So it always pays to shop around and find the best price for your Mazda car service, not forgetting that the experience and reputation of the mechanic should be considered as well in these costs.