I am semi informed , I have been driving a gas truck for 9 yrs. The terminals do not play with diesel fuel. they do play with rvp of gas levels in the spring and fall. The diesel fuel problems are just consquence to another problem, either at the gas station or with your fuel filters. diesel is lighter than water, so water will settle to the bottom. they could have been low on fuel and you sucked up some of the last fuel in the tank, which trapped water in your fuel filter. Or you had water in the filters and its coincidence. however the ceatane levels of fuel in the U.S. are significantly lower than those of other countries that burn diesel ( i.e. tree huggers.) Higher ceatane levels result in better running diesels, Try powerservice diesel kleen. make sure that you get the one with the ceatine increaser. probably T.M.I .but just trying to help