To: Redtail
First of all, welcome back. Shell went through a major reorganization several years ago and downgraded their aviation section in their Houston home offices. They spread the responsibilities of the aviation department around into other organizations and it became very difficult to get any information. In my job I deal with aviation lubricants as they deal with reliability and maintainability and in some cases safety. Whenever I had a question after that time I would have to call the UK for an answer. In 1997 Shell published “Shell Lubricants Handbook and this is available from their Houston offices. It has a section on aviation products but it does not go to the depth of detail contained in the Grey Bible. I would suggest you get both since they are free and you can cover all bases as the handbook described above stresses industrial lubricants which will cover your GSE / AGE.
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The Cat