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How big/easy a job is it to cure the problem of, or replace valve stem seals that leak slightly that cause a bit of a smokey start?

my car smokes just on start up and does smell a bit the rest of the time.Its a 320/6 only covering 40000 im hoping its just the valve seals.

Head off. Plus a bit of fiddling with a valve spring compressor. Its not too difficult if your comfortable with taking the head off. plus, its an ideal oppurtunity to lap your valves in and have a general clean up of the valves and combustion chambers.

also a very good learning experience and allows you to learn lots about the bmw head and how it works

I have a ssetof valve spring compressors if you need to borrow them

Thanks guys, im doing my homework on an engine i may buy. Cheers for helpful replies!