With the new low sulfur I allways add power service for lubrication I may not need to but for my own peace of mind. Sulfur is what lubricates the upper end of diesels.
Could be they received a bad load of fuel or there storage tank was getting close to empty and your ended up with a lot of moisture in the the fuel. Some times when they fill the storage tanks it sturrs up all the crap from the bottom and suspend`s it for awhile.