They've been using low sulfur diesel fuel (0.05% mass) in parts of California, beginning with south California since 1985, have there been any problems with MB diesels in that 21 year time period because of low sulfur fuel?
This is from a Chevron website, copied and pasted here, but you can read it in its entirety here, which contains additional interesting information about diesel fuel.
http://www.chevron.com/products/prodserv/fuels/bulletin/diesel/L1_toc_fs.htm
Does low sulfur diesel fuel have enough lubricity?
Yes. Even though the process used to lower the sulfur in diesel can also remove some of the components that give the fuel its lubricity, reputable refiners monitor this property and use an additive, as needed, to raise the lubricity to an acceptable level.
Will low sulfur diesel or low aromatics diesel cause fuel system leaks?
The introduction of low sulfur diesel for on-road use in the U.S. was accompanied by fuel system leaks in a very small percentage of vehicles. Investigations into the cause of these leaks suggest that the problem was linked to the change in the aromatics content of the fuel and to seal material and age.
Diesel fuel systems contain "O-rings" and other parts made of elastomeric materials. These elastomers swell slightly when they contact diesel fuel, because they absorb aromatic compounds from the fuel. Exposure to a fuel with a lower aromatics content will result in some of the absorbed aromatics being leached out, causing the elastomer to shrink towards its original size. If the elastomer is still pliable, this shrinkage will not cause a leak. However, if age or service at higher-than-normal temperatures has caused the elastomer to loose its elasticity, a leak could occur. Vehicle owners should be aware that elastomeric parts have finite lives and should be replaced as necessary.
By itself, low sulfur or low aromatics diesel fuel does not cause fuel system leaks. They are caused by the combination of a change from higher to lower aromatics fuel and aged O-rings and elastomeric parts that have lost their elasticity.