8pcs Engine Pistons Set +0.5mm For W222 W166 W221 This 8-piece engine pistons set is designed for vehicles equipped with M278 V8 engines and fits models including W222, W166, and W221.The set includes pistons, piston rings, and connecting rods, providing all necessary components for a complete engine rebuild. Made from aluminum , the pistons feature a standard design with a +0.5mm over-size diameter to accommodate cylinder bore expansion.This design supports under thermal loads, with resistance to vapor emissions at temperatures up to 105℃. The components are engineered to meet specifications for proper fit and function.Compatibility is specific to certain engine types, precise integration into designated engine platforms.Installation requires standard mechanical procedures and tools suitable for engine assembly. This replacement is made by an independent supplier.All brand references are used solely to indicate compatibility.