I have been using Fram filters for over 30 years now and have never had a problem with their performance. Never a leak and after 3000-5000 miles every time my oil still has that clear (translucent) appearance. Really, the key to keeping your oil and engine clean is to faithfully change your oil regularly. I have two vehicles...one 1996 with 180,000 miles and the other 1964 with over 300,000 miles...where neither burns any oil between changes and continue to run smoothly.