I am sorry, Cheryl, I can not say - my Sorbolene does not sit for so long, and my 1 litre bottle is well used within a 12 month period. I did check my Redwin Sorbolene labeling to see if there is any indication of a shelf life (many products have a "best before [date]" label), however, there was not any. If it were me, I would throw the old one away and purchase a new 1 litre container of Redwin Sorbolene (~6$ from Coles Supermarket) to be sure to gain the benefits of the product.