A year or could be two years ago, I was buying more non aerosol WD-40 because it was at a discounted price, and noticed the can and display stated "New Formula". The sales person said it worked the same. While deciding to open the new can to see if there were any difference, gave it the sniff test (that past), found it did not prevent rust on cast iron as well as the old formula nor did it make removal of rusted on bolts as easy to remove as the old.
Grant