Quik LS said:hang on. You are a new poster - so one thing that you I think you missed - the pre-03 V8 (mid-2002) LSes suffer from a valve cover gasket design issue. There is a TSB that caused Ford to re-design them - as the original design would leak under 'normal' driving pressures. The oil would get into the plug wells and short out the coils.
does spending more time at WOT likely cause this design defect to show up sooner - maybe - but if you can't drive the stock car completely stock -then the only thing he is right about is that if you leave the car in your garage it will never break.
Yes I am a new poster; and I am very well aware of the design issue. I'm also an ASE cert. mechanic, and unlike the dealership and FMC, I will be the first to tell anyone that hard driving does not in anyway cause the cam cover gaskets or plug well seals to fail sooner than later; they are non-wear components which are subjected to virtually unchanged conditions between idle and red-line. As cars have PCV valves and breathers (depending upon your emissions compliance), pressure build-up in the cam covers SHOULD be very minimal (exception to this is valve seat/seal wear; this will cause excessive pressure in the cam covers). One note to this is, as I'm sure you are aware, oil pooling. For those not in the know, higher RPM's can cause an increased delivery of oil throughout the engine (this is actually a problem in the 4.6L which can cause oil starvation to the lower end); this increased delivery of oil will result in more of a pooling due to the speed at which it drains back through the oil galleys. However, this alone will not cause gasket/seal failure... BUT it will definitely make the leak heavier, and there for more apparent.
As far as your last statement... I totally agree. You'll be hard pressed to find a car that doesn't have some kind of quirks; it's the cost of owning a car. If you don't want it to break, don't drive it. Does hard driving cause more wear on your car? In some aspects, yes, some no. But I think that's a choice we make. When I take my truck off road or mudding, if I break a front CVD or a rear axle shaft I can't very well get mad about it.
The long and short of it; OEM or aftermarket parts, it doesn't matter... it is a piece of machinery and it will break down; Drive it like you stole it... you'll fix it more often. As you said "if you leave the car in your garage it will never break".
(added note: Althought I am ASE certified, my line of work is not in the realm of mechanics; hasn't been in a few years, I really only enjoy working on my own cars and helping friends out with theirs so I moved on in employment.)