Ilford Ilfotol use after expiring date

I've just found out recently that the Ilford Ilfotol surfactant that I use to make my diy RCM fluid has an expiration date and that shelf life once opened is 12 month. I would like to ask to the expert what can be the impact on using an expired product of this type, if any. For sure I didn't noticed anything wrong last time I made the fluid, no particles or mold traces.
Thanks in advance for who will take the time to reply.