Having seen two or three Delvacs using 1-5% of Polybutenes along the lines of Lucas I looked through others and saw two of them containing Olefin Sulfides
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Olefin sulfide: What is it?
I was looking at the MSDS for Shell Spirax EW gear oil, and Olefin sulfide is one of ingredients. I know that many gear oils use sulphur/phosphorus compounds as their EP, and Chevron uses borates in Delo Gear Oil, but I haven't seen Olefin sulfide before. I did a Google search and found it is...
bobistheoilguy.com
In case someone doesn't mind to comment: You probably have a week or so now over here