The Oil Refinery is a large, industrial structure with a blocky, isometric design consistent with Factorio's pixel-art style. It features a central cylindrical tower with multiple pipes and vents protruding at various angles, suggesting complex internal machinery. The exterior is primarily metallic with a weathered, industrial texture, showcasing rust and wear marks to imply heavy use. Color scheme is dominated by muted greys and blues, with occasional bright highlights on control panels or warning signs to denote interactivity or hazard areas.