Black smoke from an exhaust are hydrocarbons which I thought was burnt fuel, too much of it :nenau
Having said that i did physics so chemical concoctions are a mystery to me :doh
might have got it the wrong way round then lol
i have the complete y61 service manual stored in my documents , but i dunno how to send it to you , or post it on here for that matter :nenau
If the smoke continues, and it is running nice and even then most likely turbo related, turbos are very reliable today, so first to check is egr common for ss pipe to split so loosing your turbo pressure, I have a spare MAF Hitachi AFH55M-11 but it was from a petrol so unlikely to fit, but give yours a clean first, Rick
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