Engine probs

Thanks for all the ideas - I am clueless! Just to get an idea, how much would these problems cost to fix (if it is one of them)

Cam belt tensioners?
Cracked manifold?
Aircon compressor (although it does it with aircon off on start)?
 
cracked manifold? I fail to see how that could cause either a rattle or a vibration.

As above, the engine has scores of moving parts, could be any of them.
 
Trouble is the vibration/rattle (fast - almost sounds like a mechanical buzzer) is severe and the guy at the garage said its not something he had heard before - and I'm sure he would have heard tappets.

It is a bit messy in the oil - no brown froth or anything suggesting head gasket etc but oil is very black and looks like a few bits - was fully serviced about 5k ago!

How would the gunky oil problem be cured - full oil/filter change etc?
 
full oil change as opposed to changing just half? lol

a good was of cleaning out old gunked up engines is to A) get rid of the current oil B) buy some cheap suitable oil and some auto gearbox fluid C) add half a litre of auto gearbox fluid and then add the other oil as usual D) do a few hundred miles.

ive done that a couple times on my 167k mile golf gti, my oil stays transparent for about 6k miles (and then it starts to darken a bit)... then i change it.
 
Well, got the motor back - and BMW main dealers cant diagnose it - they heard the problem and 'think' it may be the variable valve timing mechanism' but beliebe that if they strip it down (min £500 not on warranty) they probably wont see anything as it goes away when warm and will end up guessing which parts to change to maybe solve the problem! They said they never have problems with the 2.0 TU engine!:(

They suggested I carry on driving it till it gets worse!!!!! and hopefully they will catch it before it does any really serious damage.

Last time I buy a car from Sutton Trader Cars - he must have known about this and covered it up!

They dont think it is the hyralic lifters, tapetts, etc but at least they didnt charge me (and even did some recall warranty bits from 5 years ago for free!)
 
Doesnt make any rattle when starting from warm - thought it might be gunged up oil as suggested inearlier posts but BMW dont think so - am sending it to a cheaper garage to have a flush and oil/filter change to see if that helps.
 
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