Hello gentlemen and my neighbor across the street from me has a civic thats the same year and model(03' LX, 1.7L 4cyl) and he has lately been running the Rotella T 10w30 oil. He is running 5500 mile oci's. He asked me if this was ok and if it would hurt anything. His civic does not use any oil, does not burn or leak any oil. I helped him change spark plugs, and his valve cover gasket and the cylinder head area looked very clean. Thanks in advance and have a great weekend folks.