Don't understand a lot about mazda motor saw that have ddhc 16 val does that mean the motor cost more to for a oil change and other stuff or it has small upgrade inside that make a huge difference or is that just a motor size ddhc mean?
Dohc, mean dual over head cam. Nothing very special better then a sohc, which is a sigal over head cam. Oil change is the same as any other car unless your useing regular oil or synthetic
