Generally speaking, they are not as high of quality as the Mahle filters, but if you change your oil and filters regularly, it shouldn't pose a problem.
With that said, you stated that the last time you changed your oil was sometime last year. Even if you don't drive your car very many miles per year, it should have the oil changed at least twice per year. How many miles and how many months are you putting on your oil before changing it?
1998 BMW 328is
1966 Pontiac GTO
2007 Subaru Impreza 2.5i 5-door
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