I have been browsing the boards for a while and I see quite a bit of noise about Purolator filters failing. I also see that Motorcraft filters are made by Purolater but on a different line. I plan on using conventional Quaker State 5w30 with a 5000 mile change interval. Are the Motorcraft filters better than the Purolators or do they suffer some of the same QC problems? Would I be better off using a Extra Guard or Tough Guard? Fram at least doesn't try to hide their filter ratings or try to feed you meaningless marketing [censored].