i use nissan filters on my Z...but all my other cars i've used puralators w/o problems, never been a fan of fram i just didn't like the way they're made and when i install fram filters on my friends vehicles it just doesnt feel like its worth the extra few bucks compared to a puralator filter that is nicely priced and performas well....why i use a nissan filter on my z? just because i found sticking with oem on the z always resulted in less problems