AeroShell Oil Diesel Ultra is unique in being the only fully synthetic diesel engine oil available in General Aviation. AeroShell Oil Diesel Ultra's formulation has been developed for piston engines burning Jet A or Jet A-1, designed for use in the latest highly rated turbocharged diesel aircraft engines under all operating conditions. AeroShell Oil Diesel Ultra MUST NOT be used in spark ignition, or Avgas powered aircraft engines. It also provides superior piston cleanliness resulting in a clean, efficient and reliable engine due to it's unique Shell approved additives. The Diesel Ultra has been developed with particular reference to excellent component wear protection and engine cleanliness and includes a powerful surface acting agent, which bonds to the surface of highly loaded engine parts, protecting the engine from scuffing damage. These additives have been developed based on flight experience with diesel aero engines over recent years with substantial engine and component endurance tests with all major Diesel aero engine manufacturers. AeroShell Oil Diesel Ultra has been optimised to cope with the demands of this unique type of engine/fuel combination. Its key performance features include the ability to sustain high bearing loads, neutralisation of acid build up from the Sulphur present in the fuel.