expiry date on fuel conditioner?

hi all, I've emailed the manufacturer (Lubetec in this case), waiting for their reply.
in the meantime, does anyone know if diesel fuel conditioners have expiry dates?
TIA

Spicy, curious as to the email reply from Lubtec. Is there an expiry date?

PM'd ya too in case you don't see this. TIA

Thanks for the PM, hadn't checked back on this one.
Lubetec's response was to go ahead and use the conditioner. I told them which one I had and the approx vintage and they said it shouldn't be a problem.
They didn't give me a "best before" date though...