Review on Maximize Engine Life with Royal 🔧 Purple 10-454 Extended Life Premium Oil Filter by Jeff Kern

I don't know how good they are. That's why I buy them. 1) They are heavy. The case is strong, and what's inside has to be strong too. 2) They publish the efficiency at a relatively small particle size. Most premium brands don't mention particle size. Otherwise, blind faith that they filter that well, and also that the flow rate through them is sufficient. I change my oil once a year and love the idea of a premium filter. I will continue to buy them.