In america, the auto manufacturers are being influenced by the Oil companies because our loose politics and lobbying industry says they can! In europe, the Thatchman society has the last say and the oil companies and auto makers are to follow suit. The Thatchman Society is the agency in england that measure particulate out put in automotive exhaust in milligrams per mile travelled.

Does this mean we should trust that the ULSD has the proper lubricity?
10,000 or 20,000 miles is nothing to these cars.

Do you think we should be using an additive? If so, what should it be and how much should we use?

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In scuba diving and skydiving as in life, if it isn't fun, your doing it wrong.

Original owner & daily driver, 1983 300SD 298,000 miles.

According to my engineer friends at the chrysler corporation whom I worked with for 16 years, Lucas upper cylinder lubricant added to the fuel in the amounts on the directions or roughly 1 gallon of vegetable oil to 10 gallons diesel should do it if your worried about your fuel! Just go into your supermarket, buy a jug of Mazola or whatever and pour it in first when you fill up with each 10 to 15 gallons! Easy as pie! My truck and both my Benz's love it! I've even used cooking oil past the pull date and just poured it in straight along with my Biodiesel! (You know, you exhaust will smell better too! Don't be suprised if the diesel rattle quiets down some too)

No additive is needed. I actually posed that question a few months ago and response I received was that the ULSD lubricity standards are better than the previous LSD standards and #1 diesel standards are.

If you live somewhere where it get below freezing often in the winter, an additive that gets rid of water in the fuel added in late fall is good.

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'81 MB 300SD, '82 MB 300D Turbo (sold/RIP), '04 Lincoln Town Car Ultimate

Sooner or later every car falls apart, ours does it later!
-German Narrator in a MB Promotion Film about the then brand new W123.

Because we dont have mandated quality control like europe. We have companies like bayareabiofuel.com go out of business due to the lack of quality control and ended up with law suites due to crap fuel.

And we have homebrew biodiesel that can be risky.

I really should put this in my sig as i always refer to it but its worth the reading.

http://forums.tdiclub.com/showthread.php?t=110004&highlight=pd+tdi+biodiesel

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Current:
05 E320 CDI
07 GL320 CDI
08 Sprinter
05 Dodge Cummins
01 Dodge Cummins

Previous
2004 E55 AMG
2002 C32 AMG (#2)
1995 E300
1978 300D
1987 300D
2002 C32 AMG(blown motor :[
1981 300SD
1983 300SD
1987 300SDL
2002 Jetta TDI
1996 S420
1995 S500
1993 190E 2.6
1992 190E 2.3
1985 190E 2.3 5-Speed