The Motorcraft 820S has the Bypass valve on the threaded end of the filter. That's where Ford wants it and it's set to the correct psi according to their specs. Mobil 1 and K&N filters have the valve located in the dome end (as does almost everyone but wix)and possibly doesn't have the exact psi setting Ford mandates. I want to run the 820S. I am more than sold on it. That is not the question I have. Since so many synthetic oil change specials include either the Mobil 1 or K&N filter I'd like to be able to take advantage of the deals. Instead of using them as high end paperweights. Is the Bypass valve location and psi setting, of these filters, potentially damaging to a Ford Modular 4.6? Looking at a 1 year 12,000 mile interval.