Evolution, now green, replaces the older red No Toil we were very fond of. It has an aqueous carrier agent to replace the isopropyl alcohol, which addresses concerns about shipping regulations, wrecking filter foam and especially glue degradation.
It does not make the filter expand when applied, and if left in for long periods (over three months), does not stick the filter to the cage or air intake boot.
Cleaning is much better than standard oils. With the No Toil cleaner and warm water the filter comes out pretty spotless.
The only nontoxic, biodegradable filter oil.