I wonder,

Does more than "sufficient" cetane improve running or do you just have to reach a certain cetane level for a given engine? In gas engines, once the required octane rating is reached given a certain combustion chamber design and compression rating, more octane is not going to help much.

Related question: Do you have to reset the injection pump timing advance in order to make use of higher cetane?

Sholin

p.s. I don't own a diesel, so these questions may be obvious to someone who does.

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What else, '73 MB 280 SEL (Lt Blue)
Daily driver: '84 190D 2.2 5 spd.