FYI, we did NOT test Redline or any "beano" oils, because of their exclusivity to the race market, there might be a change to that now (since 1986)..... This was a "commecially available" story, slickly speaking..... Oh, and tested the Slick 50, so did GM and there's a 49.95 joke and a half........ Filter of choice,BTW is the FRAM HP1, which is also the Ford FL-1A....... Scott