Okay this is all because of the lies I've been told and had read about concerning our Amazing Ford 5.4 Variable Timing engines. I've been "hot rodding" now for 65 years and at a young age 2 yrs HS auto shop and at 19 began disassembling, inspecting, and overhauling helicopter transmissions. this just means I've been around not smarter, better, or more experienced than any of y'all, just been around. Been through lotta schools too. Do all my own work, incl; body, paint, upholstery, all overhauls, unless i want it done better [which i've needed a few times]. SO NOW EXPEDITIONS, I've two an 06 w/156k n 13 w/132k. I've been using FRANTZ Toilet Paper Filters on eng n trans since 1976. BUT, now or the last two years when driving the 06 it has the timing chain rattle and I've just kept the RPM a little higher at low speeds, PITA, because I'm sorta lazy, and because I figured it was the Tensioner(s) blown gaskets. Finally with the Mrs's after me "hard" all the time for using her 13 i decided to tear it down. A very big PITA. Searching by telephone and online for fixes from independent shops and Ford I found prices ranging rom $2200.oo and $5500.oo and o course Ford recommending a new engine to many of our fellow 5.4 owners. So with the RANTZ filters my oil is "always" like new clean and the filters never showing any any metal or plastic particles. I was concerned about the plastic(?) rails breaking apart, like so many *mechanics* say happens, but yes i'm sure they might[but?] I inspected the rails and found the wear so slight and difficult to see and only one short space was able to "not catch a fingernail" but eel an edge. I've new rails so I'll replace them. BUT, just a visual inspection of the tensioner gasket shows it blew out the same amount in the exact same place on both right and left Tensioner gaskets. The torque was tight on the tensioners, and the tensioners also have a ridge around the edge of the tensioner to hold the gasket in place [so why did it blow out?] but it didn't it blew out at a corner. The engine warranty of 50k just doesn't cover a $2.79 gasket and 2-5,000 dollar repair that fails at over 5k miles. And, i think Ford engineers knew or suspected the plastic or gasket may fail early in the engines life. Now, my dilemma is there is no gasket with the Melling tensioner. I read somewhere, in my very long gasket search, that they are just steel on steel as both are machine surfaces and even after 3yrs of machine shop training in the 1950's ( I understand, but WHA? No gasket ... see old' ). So I must convince myself to reassemble that those machine surfaces without a gasket.