The bmw heads (I had one) didn't crack because they were aluminum they cracked because they were a poor design which bmw fixed.

When you say "they" throw them away who are you referring to.

I have a friend with an airplane, I bet he doesn't throw his heads away.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.

The BMW heads cracked because they had high stress and failed under fatigue.

I duh know... I war reading about aircraft engine overhauls somewhere on the Interwebs.

My bro-in-law and his girlfriend have a couple of planes. I don't trust him enough as a pilot or a mechanic to go up with him. One of their planes is a ~30 years old single-engine and they use it to go back and forth between Miami and the Bahamas. No thanks.

I'm going to continue driving my MBs despite their aluminum suspension and other parts. I will also continue to replace steel and iron parts on my Formula F race car whenever possible.

You better sell your Bimmers since they have all those aluminum parts which will always fail. But it is highly unlikely you will ever find any car that does not have them.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.

I've only taken one BMW past 100k miles, and I learned my lesson. With our current ones, once they hit 100k miles, I'll call the next owners and tell them to bring money and take the car home with them.

The failure point of those aluminum suspension parts are probably way out past 1,000,000 miles. But, cars occasionally rack up that many miles, so they probably make the failure point somewhere past 2,000,000 miles.

A friend of a friend has a 1,000,000 mile Toyota Starlet. It got him on David Letterman's show back in the day...

https://www.youtube.com/watch?v=XQJhdy8y7iA

Then we agree this failure of aluminum is more likely to happen after 2,000,000 miles.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.

A co-worker worked part-time for a limousine company. This was the GS-11 BSEE who was crazy, homeless, a millionaire, wouldn't take a bath, didn't show up for work and still got paid, slept all day at work, and had a wholesale fish business he ran at night before we moved to Floriduh.

A driver was driving a stretched Lincoln, called the dispatcher, said there was a funny noise coming from one of the front wheels, and asked if he should bring the car back in.

The dispatcher said "No, drive it until the wheels fall off."

A few minutes later, the driver called back and said "The wheel fell off. Now what?"

Stretched limo's are a lot heaver than they started out being before being stretched. So, all the components are stressed far beyond what they were designed for.