this same type of question has been asked and answered about a bizillion times on here do we realy need another tread on oil?
This has and will always be a personal choice and you will get people that like dino and say synth will cause leaks, and you'll get people that like synth and say dino doesn't last long enough. Would you rather pay twice as much but change it half as much, or would you rather change it twice as much and pay half as much. Your engine isn't smart enough to care.