Yes they are susceptable to swirl flap failure, rare as it is...roughly £200 will see the flaps removed and correct blanking plugs fitted instead at PMW Chelmsford, other indies will be able to offer this service too, we have had 2 x 320d's altered by them, they willsell you the blanking plates for self fit if you feel up to it....whilst there the EGR valve requires periodic cleaning out.
Other underbonnet issue is the relatively short turbo life, most seem to go around the 45k mark, so hopefully already been replaced....i blame ridiculous oil change intervals, and the modern motorists lack of due care in use, ie warm and cool down periods,...yes i know its a Luddite view and no longer fashionable, but those who want to abuse their vehicles please carry on and enjoy doing so, i shall continue to maintain and treat mine with due diligence, we'll see whos lasts.
Front suspension bushes will be coming up to their time, probably getting spongy, eventually the suspension starts knocking, easy to check...grasp front wheel and try to roll the car forwards and backwards by the wheel....if the wheel shows fore and aft movement then the bushes are worn, possibly needing kit including wishbone, not a bank breaker, get a good indy to do it.
If its auto make sure its had an oil change, i don't know what mileage is recommened and i dont know if BMW indeed do recommend, around this time both BMW and MB and others decided auto transmissions were sealed for life, unfortunately that life turned out to be rather short and the policy has been quietly dropped.
These are things i know of, no doubt others will add to this, presumably you've had a poke nose at HJ's reviews above ^^, and had a read up on BMWland forum.
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