HiYa Kevin!
I too wondered about the 2015.5 designation when we were shopping for the life partner's XC60. As best I could tell it was a running model year change that consisted mostly of making certain existing features standard and rearranging the trim levels.
Check out the info here: https://www.media.volvocars.com/us/en-us/media/pressreleases/149479/whats-new-20155-volvo-s80
Looks like the T6 was either Premium or Platinum, no plus. According to the above, Platinum trim level will have the Harmon Kardon Premium Sound System, active dual xenon headlights, and Convenience and Technology packages.
Insist on seeing a complete service history; if there are gaps, question them!
Happy hunting,
Will
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XC60 / Odyssey
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