Greetings: I contacted Luber Finer CS and requested "Specifications for Luber Finer oil filter PH2808." This application if for my vehicle in signature. "Efficiency – 20 micron at 85% Minumium Capacity - 4 grams minimum Hydrostatic burst 300 psi minimum Tech Hotline Phone: 800-882-0890" Not impressed with efficency, but I appreciate Champion responding in a timely manner. I e-mailed Wix concerning the XP 5334 and they told me they only publish specs for their premium line. When I retorted that it is your premium line, they responded that they specs are not published for the public. That bad! Don't get me wrong Wix makes good filters, but I don't like their efficiency. But, I've "heard" that they XP filters are great for fuel dilution. My mechanic holds Wix in high regard. I would still purchase Wix filters. But, I have a stash of Ultra XG9688. Respectfully, Pajero!