Honda FEO 10w30 is fine and well priced. Most people on OH will agree with me.

I'm using Nulon "fully synthetic" 10w40 on my 1999 Civic coupe. It's well priced and a little better than FEO imo. However, FEO is fine.

15w40 is not the correct viscosity for ur Civic. Use a 10w oil.