George, of all of the things I know about GM, I can honestly say that I would never buy anything from them.
First thing - GM is a cheap outfit. I was told back in the 1960s that if you could save them a penny on every car they made, you saved them a million dollars. That was back in about 1967. Considering the difference in value of a million dollars then and what the current equivalent is, that is a lot of money. That means that GM is searching for any way they can to cheapen the cars they build. If that means parts made of chinesium, then that is what they use. If it means using 3 screws instead 4 or 5 to hold your instrument cluster in place, then they will do it. Even if it means that many more squeaks and rattles further down the line. Long after warranty is expired.
The only car that GM builds that I would ever own or consider recommending to a friend is Buick - and even they are going down hill.
A classic example is the small block Chevrolet V-8. A fairly well designed engine. Compact, powerful for its size, and lightweight for its power output. But, they ate camshafts and lifters like they were made of peanut butter. Why? Because they bought cheap reject steel that was turned down by the other carmakers. Instead of making doors and fenders out of it as it was sold for, they made critical parts out of it. Camshafts, lifters, timing gears, rocker arms, and push rods. Why did they fail frequently? Because they were made from the wrong material.
How do I know this? Because I lived near the steel mill that made the steel for their engines. At that time, my closest friend was one of the melt shop foremen. He saw it happening. When they scrapped a heat, it went into ingots and was put out in the yard. Some was re-integrated into the next heat if they could get it into proper chemistry. What was left was offered to the car makers to be used in NON-CRITICAL components. It was offered at bargain basement prices. GM bought it all and had it shipped right into their main Chevy engine plant. Wonder why it wouldn't take case hardening, nitriding, heat tempering? Because it was off chemistry.
Even as a Ford mechanic, I must have replaced dozens of Chevy cams. Know how many Ford cams I replaced in 30 years? TWO!
Want me to keep going about GM? I got lots more to tell. Maybe I should start on the wonderful 700R4 transmission. But, I'll save that for another time.
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