The new ones are a bit better, but the old one is OK to use of it's not rusty or something.
Originally Posted By: river_rat
Here we have two Purolator L10193’s—new and old, and a non-Ecore STP equivalent, courtesy of labman. Thanks labman!
The new Purolator Classic (97.5% efficient) and old Purolator Premium Plus (96% efficient) have the same amount of media, approximately 100 square inches of surface area and 2.6 cu in total. The non-Ecore STP has about 144 sq in of surface area and also 2.6 cu in total…it’s thinner than the Purolators.
The flow rates were all quite good, and a tie for all three in the testing.
It does appear that the new Purolators have improved over the old ones. The New Purolator tied with the STP, and both were superior to the old Purolator:
Filtration results Left to Right: New “Purolator Classic”, (Non-Ecore) STP, Old Purolator “Premium Plus”
These STP's if you can still find them, are very good.
The Puro media does appear to be improved from the old style (and it says so on their website)