Plastic valve covers and intakes don't bug me. The valve covers only really encounter oil vapor windage, and really don't seem to fail, certainly not on the 4.6 2Vs at least(which were plastic from inception in 91), or any other 90s era Fords with them(vulcan, later 3.8s, duratecs)I can think of. Intakes aren't really a problem either at the heart of it and the lack of heat soak is a good benefit in addition to the weight saved, the problem is when the companies cheap out and flow hot coolant through them for one piece integration rather than a separate isolated crossover. GM LSx engines have had isolated plastic intakes forever, and the only things that break them are nitrous backfires, 96+ 4.6 2Vs on the other hand with their neatly integrated coolant crossover and thermostat housing? Yeah, Ford lost that lawsuit and deserved it. I am very uncomfortable of the concept of plastic oil pans for that reason, at best they save 7 or 8 lbs tops, and when it fails from years of having a pool of hot oil sitting in it the engine is simply going to grenade when it pops. I mean they couldn't have found a less critical part to get that weight out of? A Fusion platinum weighs 3913lbs for god's sake(it amazes me people still think MN12s are heavy), there has to be something!