I ran the 240D on ULSD last year when the ARCO pump had it.....they then switched it back to #2 after a few months. It's hard to determine any difference due to inconsistent driving locations for each tankfull. It did still smell like diesel and the fuel was blue! It ran fine but I had been blending it with a cube of SVO and filling the rest with ULSD.
The Chevron i got ULSD more recently in the W123 240D is clear or close to it. I have yet to run a full tank through it but it appears to be yielding near the 30mpg mark but i'll have to see at fillup time.
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