cannot remember if ive mentioned..but have you checked the oil feed pipes to turbo,on my 335d i replaced the small turbo oil feed pipe,,the crimped joins to the rubber were knackered,,also leaking from the banjo bolts which have 2 copper washers,,the washers can fail as they are the crush fit type ones,,bmw dealer part and 4 copper washers..cost me less than £50 and easy to fit,,dont know where they are located on the 330d but real oem will tell you.ps the oil was dripping down over everything,,dont know what it looked like under load but my guess was plenty more oil leaking/squirting
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