Are these fairly new to the market or have they been around for a while? I don't recall seeing them but then again I am not looking for them.
What's the scoop on them, are they a worthwhile filter?
http://www.pennzoil.com/en_us/products/a...2NhbGU9ZW5fdXM=
Considering them, but I am not sure if I can find them nor if they are any good?
What's the scoop on them, are they a worthwhile filter?
http://www.pennzoil.com/en_us/products/a...2NhbGU9ZW5fdXM=
Considering them, but I am not sure if I can find them nor if they are any good?