The need for special treatment or oils for your outdoor furniture depends primarily on the material. For classic wood furniture, especially teak, applying a specialized teak oil annually can help maintain its original honey color and prevent it from weathering to a silvery-gray patina. However, some prefer the natural weathered look, which requires no treatment. For other woods like cedar or eucalyptus, a protective sealant or oil is often recommended to prevent drying, cracking, and moisture damage.
Metal furniture, such as aluminum or stainless steel, typically does not require oils but may need occasional cleaning and a touch-up of paint or powder coating if scratched. Wrought iron requires vigilant rust prevention with paint or sealant. Synthetic materials like resin wicker or plastic generally only need regular cleaning with soap and water.
In summary, while not all outdoor furniture mandates special treatment, applying the correct oil or sealant based on your material is crucial for preserving its structural integrity, appearance, and extending its lifespan against sun, rain, and temperature changes. Always consult the manufacturer's care instructions first.