I cut open a used PureONE, Premium Plus (now called Purolator Classic) and a ProLine 14459 for my '95 Acura to see the differences visually.
My semi-educated opinions: The ProLine and Premium Plus (Classic) are very similar. Almost identical. The difference in the amount of media isn't worth the extra $1 for the Premium Plus, IMO. It was hardly noticeable. The only way i'd probably spend an extra dollar for the Premium Plus again is if the media was actually different/more efficient. The PureOne had the most media by appearance and was also the most uniform, even after 5k of use in below freezing temps. The Premium Plus had 3k on it and was just removed from my car less than a week ago. The ProLine sat in my garage for months and was used for my Auto-RX Rinse phase for 3k miles (IIRC) as well.
My semi-educated opinions: The ProLine and Premium Plus (Classic) are very similar. Almost identical. The difference in the amount of media isn't worth the extra $1 for the Premium Plus, IMO. It was hardly noticeable. The only way i'd probably spend an extra dollar for the Premium Plus again is if the media was actually different/more efficient. The PureOne had the most media by appearance and was also the most uniform, even after 5k of use in below freezing temps. The Premium Plus had 3k on it and was just removed from my car less than a week ago. The ProLine sat in my garage for months and was used for my Auto-RX Rinse phase for 3k miles (IIRC) as well.
