Only thing bad about doing it yourself is if a problem goes on with the motor you dont have proof of when your oilchanges were done and theyll throw it at you as a reason to getting out of covering the fix. had an rx-8 before this and luckily i keep every single document for my cars. motor died one day and they tried to say i didnt get my oil changes regularly. went and got my paperwork and shut them up
had a brand new motor