So the engine's not the problem, it's a culture problem in the UK that Brits don't know how to check their own oil levels, repeatedly running a car low can result in additional ring wear that makes consumption worse and worse the more times you run it low, in the US duratec/MZR engines don't really consume oil or fail spectacularly, apparently as stupid as Americans are about cars, the average American still has enough sense to pull a dipstick and check it on occasion and knows that a knocking noise is very bad. Plus you said your an Engine builder, on an Island where smaller displacement and smaller cylinder count engines are very popular, "I've seen" is still not evidence of a widespread problem, It's merely confirmation bias. The UOA section on this site has shown time and time again that duratec are very easy on oil, and as the mileage creeps up, maybe a quart every 5000-10000mi is normal consumption. The OP here is clearly a DIY'er that knowns how to check his oil level, so why bring up "I see a lot of these engines that are very popular on the Isle of Britain fail because Europeans and the Brits don't know how to check their own oil."