An additive for engine oil of the present invention comprises: a compound containing a metallic element, wherein a metal oxide obtained by oxidizing the metallic element has a catalytic action which promotes burning of a particulate matter contained in exhaust gases discharged from an internal combustion engine. The screed apparatus enables concrete to be easily screeded and properly finished without the workers doing the same on their knees or bending from the waist. As such, an opening of the pipe joint is sealed while preventing the sleeve from being deformed due to the partition cover being mounted. Conductive sections that electrically connect the upper wiring and the active region are respectively provided on the concave portions on the active region rows.