aluminum blocks and heads are in most of todays cars which means you need to be a bit more careful when you work on them. But bmw is know to put in electronic gadgets that arent tested and the bugs arent worked out and those gadgets end up getting removed. For example they were the first with gasoline direct injection but the system had too many flaws and wasnt used agian because customers were the ones shelling out for the problems.

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1986 300SDL, 211K,Dealership serviced its whole life
1991 190E 2.6(120k)
1983 300D(300k)
1977 300D(211k)