Just got your PM
Hi,
Thats good.You done quite a lot of the things that could give you the smoke.

Moving on!I asked how many miles you had ,just incase you had a tired engine,200k plus and was consuming oil but since you said the smoke was a diesel smell ,and your car only done 80k,then this is eliminated!
You are sure thats its not also oil smoke?

If its definitely just a diesel smell and your plugs ,injectors,filters are all good,then it just leaves me the ECU!
My question now is,has it been remmaped ?
Give me some history about the car,or remind me!Did the car always smoke since you purchased it?This is why I think it could be a bad ecu remap!Let me know this ,before I explore other possibilities.

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2003 BMW X5 E53 3.0D-Auto, Sportpack,full extras.
Oxford green/Leder Dakota interior.
56, 875miles @24th October 2024
Heavily OE modded,including full facelift grill install.4.6is body kit,wheels,exhaust tips and ext.fender flares
Non OE mods.Depo "custom" Angel eye headlights.