im coming up on 2000 miles on my honda civic ex 2002, and ill prolly be changing my oil in mid december when it reaches almost 5000 miles. My question is can i use a group 3 oil(amsoil xl 7500 5w20) without having to worry about any leaks or should i just use regular dino oil? My plan is i want to switch over to mobil 1 5w30 or if they come out with a 5w20 at 15000 miles. I just want to know if amsoils group 3 would be a good oil for a 1st oil change.