Your thoughts Scotty?
The manufacturers insist plastic parts are better because it reduces the manufacturing costs, and plastic parts are easier for the mechanic to install and uninstall, and it is lighter therefore it improves the performance,
but I would like to hear your perspective Scotty!
The manufacturers insist plastic parts are better
they're absolutely right. Plastic parts are better ... for them.
it reduces the manufacturing costs
That's the real reason right there.
Your thoughts Scotty?
The manufacturers insist plastic parts are better because it reduces the manufacturing costs, and plastic parts are easier for the mechanic to install and uninstall, and it is lighter therefore it improves the performance,
but I would like to hear your perspective Scotty!
There's nothing quite like thousands of hot/cold cycles that embrittles plastic. The manufacturer saves money, but that doesn't come down to you. A few 10s of pounds isn't gonna break the bank. They got cheap because they basically can. They're rich men's toys for a reason.
I had a 1994 BMW 540i in 2013 as my first car, before they made them into plastic heaven. I had little issue with it, except that V8 engine hid a $70 power steering hose that was gonna cost an arm and leg to replace, so I sold it around 2 years later. You had to take the engine out of the vehicle in order to work on the power steering.
@justin-shepherd Nice car. Why did you sell it? The 540 was a chick magnet! lol
Because I was only in college, lol. The power steering itself was funky, too. I'd move the wheel probably an 8th of a turn to the left before it would respond, lol. If I turned to the right it was fine. If I had waited until I was older, more resourceful, and I had more car knowledge, I would've kept it. It was black, lol. Must've made a lot more left turns than right, haha.
obviously wanted to keep you 'right'! ooh the stories it could tell.. lol
Yeah, lol. I saw the same car a few years ago in a Facebook Marketplace ad. The power steering had completely gone out. A slight bit of damage was caused by a former friend's boyfriend at the time that matched the car's damage. I was a freak about those sideboards. It'd be 30 years old this year. Time flies.
There's nothing quite like thousands of hot/cold cycles that embrittles plastic.
I remember thinking the first time I saw an engine with a plastic intake manifold "You have got to be kidding me!" Fortunately I've never owned a car with that kind of nonsense and hopefully never will.
What's next, something like this?
didn't even run for a second hehe 
Powder metal could be the future though ...
https://www.horizontechnology.biz/blog/powder-metal-vs-forged-parts-advantages-disadvantages
When I had my BMW X5, it was the plastic components that failed: Valve cover, PCV valve, DISA.
My PCV valve failed as well once and it sounded like a rubber chicken steroids. It was also plastic. The PCV valve was more like a plate than a valve..