Diesel Fuel Lubricity

I just bought my first Mercedes a week ago. I have seen and heard quite a bit of discussion about the diesel fuel lubricity of the new low sulphur fuels. Naturally, opinions I have found seem to range from "Hey, it's no big deal", to predictions of doom within the next 12.5 minutes, none of which site any decent sources for their information. The standards of fuel production specify lubricity, but there seems to be some scepticism about how closely the refiners and distributors are adhering to those standards, and for that matter, whether the standards meet the needs of diesel engines. What is the informed opinion? Are additives necessary? If so, what additives offer the best performance at a reasonable cost?

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