Does Sea Foam have an expiration date? [SOLVED]

Hi Bruce.  A can of Sea Foam with an unopened seal will not change, so will last longer than you and me. If opened and the cap is on, I always encourage people to use it right away, even though it will last for a long time. You can add it to ANY engine fuel, to any oil crankcase,… no reason to keep it on a shelf. Hope this helps!