there's perpetually "new" Z formulations for many products..... the last time I am aware of that Z5 was improved was sometime back in the area of January.....
I got my shipment about 4-5 weeks ago and the Z5 came in a black bottle. it says "NEW" on the front. Hope this helps. This stuff is making me love life again owning a black SUV. lol:up
Hmmmmmm......... I have a bottle that I got last year. It's black and says "New" on it too............ so that may, or may not be the latest Z5 you have there!