I have x-posted to alt.autos.bmw, which is a much better place for
this type of question.
The answer is: replace it *NOW* if it hasn't been done at 100,000 km.
See http://www.unixnerd.demon.co.uk/buy_engines.html . (John's pages
have a lot of info and references.)
In roughly mid 1993 BMW switched from the belt drive M40 to the chain
M40s have a distributor at the front of the camshaft. M43s don't, they
have one coil per cylinder. So it's easy to tell which engine you have
Who needs a life when you've got Unix? :-)
Email: firstname.lastname@example.org, John G.Burns B.Eng, Bonny Scotland
You were quite right, my car (BMW 316i Compact from 7/1994) has a
chain, not a belt. I was misled by a reference book which lists all
models from '94, and which was still quoting the old specs.
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