White smoke can also be unburned fuel reaching hot exhaust manifold. Prior to ULSD, my high speed diesel dumps would produce big brown clouds of smoke. Now they produce white clouds. I miss the old days.

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2009 E320 Bluetec 117,000
1995 E300D 306,000 Sold
1996 Ford Taurus LX 130,000 Sold
1985 300TD Still 225,000 Sold
2016 Ford Fusion 24,900