The subject of this study is a 1929 Rolls-Royce Phantom I automobile owned by a private collector. This vehicle was “re-bodied” in 1935 when its original limousine passenger coachwork made by the Brewster Company was replaced with a larger nine-passenger wooden “Suburban” style coachwork also fabricated by Brewster. Replacing coachwork for the purposes of fashion or function was a common practice in the early days of high-end automobiles. The chassis, mechanical units, and the 1935 Brewster Suburban coachwork are in un-restored condition except for minor repairs and surface work. The wooden section of the body has a second coat of varnish which the current owner would like to remove due to deterioration. The interior of the body is made up of a structural wood frame, decorative wood paneling, textile floor carpets and black leather seats. The exterior of the body also consists of a structural wood frame, but the panels are woodgrain-painted sheet metal on top of a wood substrate. The roof covering is a sealed canvas textile on top of a wooden deck. Documentation of the history, materials, and mechanisms of deterioration of the automobile will be discussed. The primary focus of the study is the nature and condition of the wood, surface coatings and upholstery in the 1935 Suburban coachwork and fenders of the Rolls-Royce. The treatment proposal will take into account ethical considerations, analytical data, recommendations for cleaning and minor repairs as well as preventive conservation steps for the automobile’s long term preservation.