All these clogged filters are telling me that ULSD has a good cleaning ability. I've been using fuel additives for a long time to keep my fuel system clean so I should have no problem with filter clogging. ULSD is also supposed to have a higher cetane index than LSD so it should run quieter. Since I use a cetane booster (both with ULSD and the old LSD) the cetane index of the fuel in my tank was probably already as high as it could be, so I didn't notice any difference in sound when I tried ULSD.

About lubricity, there's an ASTM standard that requires a minimum level of lubricity, and this level is no lower than what it was with LSD. In fact it could even be higher now, but I'm not sure about that.

aklim, the main reason I occasionally sniff my exhaust is to evaluate the quality of combustion. The fact the ULSD smells less tells me that it burns cleaner, and it's probably better for the engine too. Plus it's nice not to have any smell in the garage when pulling in.

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2004 VW Jetta TDI (manual)

Past MB's: '96 E300D, '83 240D, '82 300D, '87 300D, '87 420SEL