I haven't had the rod knocking sound on startup in our fleet because I don't use the Fram filters anymore. The last vehicle I used Fram on was my Toyota FJ60 (Landcruiser Wagon). When I changed the oil, the filter would be empty because the check valve did not work and the oil would drain back into the sump. I had similar probelms years ago in with Hastings filters used on a Volkswagen. You should have heard the rod knock when the engine started. When I talked to the dealer service rep, the first question he asked was "Are you using a Hastings filter?" I'm sure I had a look of shock on my face-there were many brands of filters out there, and he knew what I was using. Just because you haven't had problems doesn't mean you should keep using Fram. I don't trust Consumer Reports on testing oil filters. They just aren't in that business, ordinarily.