Have a case of the older Amsoil Gasoline Stabilizer, before ethanol fuel (I think). It probably doesn't work on solving ethanol damage problems but can I still add it in just to get rid of it and not throw it out? It says that it can be used in diesel too, I wonder if it would contaminate the particulate filter on newer vehicles? Doesn't say anything on the bottle about being safe for cat. converters either...