soon as u start up clouds of smoke
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1998 BMW 540i Question: blue smoke from exhaust lots of.miss fire as well
Sounds like valve seals. Engine oil in the top of the head will drain down the valve stem through a worn valve seal when the engine is off. Once you start the engine the oil in the combustion chamber will burn casuing smoke. This is not a cheap repair but you might try an oil conditioner product.
sounds like you need diag and est as what is wrong and how much to repair could be several things