I used walmart black can filters for many years. When I got on bitog and started learning about oil and filters and started cutting filters apart, I began to understand the whole business. About that time walmart began dumping motorcraft and adding fram. They had MC's for $2.77. I bought out all the FL1a's and the shorter version as well. All those years using the WM black cans, I never had a problem.
Interestingly, most of those years I was using GTX 10-40 and occasionally, 20-50........
My how times have changed, now it's M1, T-5 and T-6.........
Wayne