From Rotax email 9/23/13: Rotax has announced a revision to its Service Instruction covering the proper "Selection of Suitable Operating Fluids" for the 9 series engines. This SI revision also carries some important operating tips that owners and operators of Rotax Engines should familiarize themselves with!
Of special note the SI has a change to the listings of suitable fuels. In all cases Rotax engine owners and operators should review the details of this Service Information Instruction as it has many important operating tips which are highly relevant to the proper care of their Rotax Aircraft Engine.
To further assist our readers in the gathering of relevant information as listed in this SI Revision Release, Rotax-Owner has provided the following links regarding ethanol blended fuels. As the storage, handling and use of ethanol can affect the engine and various airframe components it is recommended that Aircraft Manufacturers and owner/operators read the following information on techniques, procedures and limitations of using ethanol blended fuel.