I should copy these posts and send that to as many high school auto mechanic teachers I can find. It was a very interesting read. Thank you for the information. It doesn't matter to me if some of you differ in your insight, it was GREAT.
We need to remember that car and trucks had to drive on ROUGH roads. If today's cars spent 90% of their life on gravel roads, I wonder how long the plastic would last.
Finally, I have an 87 T-Bird. At 300,000 miles it still has the original spark plugs and wires, engine, tranny, front suspension and rear brakes. Not bad. It has a 5.0 EFI engine and gets 24 mpg on the highway in complete comfort. Not bad.