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I was at my local BMW dealers some weeks back and whilst waiting in reception, noticed that they had some leaflets about additives for both petrol and diesel. The only approved additives they approve .(BMW badged)
Might be worth enquiring about that, not sure how much or how often it should be used.
I use BP Ultimate diesel myself exclusively based upon that it contains additives to keep the engine and injectors clean. (how much difference it makes I have no idea but there must be some truth in it otherwise they'd be up in front of trading standards!)
So maybe worth a quick call to your local BMW dealership to find out about it.
Hopefully that's of some help.
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