So finally I hit the 5000 mile mark on my civic. Oil monitor states 40%, but with my constant daily commute from almost sea level to 5000 feet (81 mile RT), I figure I should change the oil. In past vehicles, I always made the switch to sythentic (Mobil-1) at this mark. Should I stay with Honda's oil, or switch to sythentic?

I welcome your comments.

synthetic FTW for any car!

You should base your oil weight on the weather you live in.

SYN. I would do either moblie 1 or Royal Purple.

royal purple if you can find it or want to order it