Ok this is an interesting one,,,,N20 about 30k miles,,,,engine making noise internally,,,,and misfires on cylinder 2 only,,,checked the spark plugs and the ignition coil were ok,,,,no signs of oil burning or fuel soaking,,,if you look at the tip of the valve is missing.
The complete tip of the valve is broken,,,the other have is still stuck in the valve spring with the keepers for the valve.
I was wondering if the valve seat or the valve guide had dropped,,,there were no signs of damage to the cylinder head.
Here is where the valve dropped and hit the top of the piston,,,,you can see the shines spot in the valve pocket where it hit,,,,the bottom line BMW had us replace the whole engine.
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bmwtechnician 
This one is ugly. I hope it will stay as a single case.
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I hope so,,,,this is a first for us.
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Same thing happend to my n20 unfortunately, same cylinder, only difference was my valve broke of at the bottom fell into the cylinder and destroyed my piston.
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That really sucks,,,,I hate when stuff like this happens on a factory engine and the engine comes apart like that,,,,these engine now don’t last like the older engine in the 80’s
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broke at 9000 rpm?
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Lol,,,,that’s funny
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Is the car tuned, e.g. BMS, Dinan piggyback?
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No tune,,,,stock engine
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Hi, I have a question not fully related to this issue. So recently I had to replace oil pump and oil pump chain on bmw n20. The oil was fully drained from the engine. How much oil should go in after the full drain? Replacement capacity is 5l as far as I know.
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5 liters should be fine to start,,,,,once you have it running,,,,just perform a oil level test
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I’m also surprised with the carbon build up with 30k miles of engine.
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On a N63 twin turbo engine I have seen as low as 26k miles,,,,,she never drove on the freeway and drove the car around town
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