油底壳 Traditional form: 油底殼 Pinyin (reading): yóudǐké Definitions: oil sump Characters: 油 - oil, fat, grease, lard; oil paints 底 - bottom, underside; below, underneath 壳 - casing, husk, shell Traditional characters: 油 - oil, fat, grease, lard; oil paints 底 - bottom, underside; below, underneath 殼 - casing, husk, shell