My employer runs mostly 1 ton 2009-2013 ford vans with the 4.6 and 5.4. all the 5.4's in our vans are the two valves, not the 3 valves. We have roughly 80-100 out of our yard and we've lost 1 motor in the past 6-7 years and that was low oil. Some have had problems with oil consumption, most...