Certain models can leak oil externally or allow coolant into the combustion chamber due to a faulty head gasket. The head gasket needs to be replaced to correct this problem.Google+
Car Problem Reports
Honda Civic Faulty head gasket may cause oil and coolant leaks
Honda Civic Problem
Engines Affected: 1.5L 4 Cylinder, 1.6L 4 Cylinder, 1.7L 4 Cylinder
Average Mileage: 157,500 mi (130,000 mi - 180,000 mi)
Visitor, 1993 Honda Civic, 1.5L 4 Cylinder
car pisses oil all over itself
Visitor, 1993 Honda Civic, 1.5L 4 Cylinder, 180,000 mi
Head gasket cracked and fluid is going into engine.
Visitor, 2004 Honda Civic, 1.7L 4 Cylinder, 180,000 mi
Overheating turned out to be a blown head gasket. Cost $1200 to fix! I've heard it's common in this make/model/year.
Visitor, 1995 Honda Civic, 1.6L 4 Cylinder, 140,000 mi
I had to replace the head gasket at 140K, it was over heating