Your free to do whatever you want to your truck. You assume you know better than GM engine engineers. But your whining about parts is a given reality for solid reasons. GM sells cars, parts are a sideline. The law requires they support a given model for seven that's 7 years , not twenty plus as in our 400 truck platform.
The sealing washers , poor man's version of a machined O ring seal. Is commonly known as a " Stat-O-seal ". Used in Aviation forever. Parker Hannifin biggest producer. Is used in many other products. There's two on your AC compressor. If you can't find them you haven't looked very hard.
You want an improvement idea? Ditch the QD's on the filter adapter. Install 1/4 pipe male to -8 37°male. Cut off the the two bump tube ends. Install -8 sleeves and B nuts , flare the two ends for 37°. Make sure the forward clamp holds the lines secure. End of adapter leaks. Use the correct size O ring on the radiator side, don't make it gorilla tight. If you loosen it all , install new O ring , prevents leaks.
Try avoid making blanket statements.
You don't like the oil design, no problem . I made a huge improvement for 15$ in hardware and 30 minutes of time.
On going preventative maintenance is part of keeping vehicles well beyond their intended service life.
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