Depends also on how long it takes before you empty all the carts after the purchase. Next, with a lot of expired carts HP has all kinds of warnings ready in the firmware. I have out of warranty heads and expired carts in the Z3100 and it still runs well. I do not see why it would influence longevity either.
met vriendelijke groeten, Ernst
Try:
http://groups.yahoo.com/group/Wide_Inkjet_Printers/Thanks for the reply.
All the carts being offered to me are in their respective boxes, unopened since they were bought. Just for curiosity...why HP puts a expiration date in the Vivera inks and printheads? If the pigment ink it´s not in contact with oxygen, they should last many years... Am I wrong?