I have an 07 Mazda3. It has been a stellar car, needing simple oil changes and a set of tires in 32k miles. Once my stash of Synpower is gone, I might just go with ASM. easy 8-10k OCI means about 2 changes a year for me. Buster's results were on an engine which probably had some breaking in yet to do, yet they were impressive.
ASM is one of the best oils out there, bar none!