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All my diesel engines start better because the additive raises the cetane rating and they run quiter with the additive because the close tolerances are lubricated properly in the pump and injectors. I do not believe in waiting until diesel gels to try to remedy the problem either!

One thing to consider here is ULSD begins to gel at about 12* F and bio diesel begins to gel at about 30* F. This is quite a bit of difference. The diesel will be ok in say a full tank but when it moves thru the smaller lines into the filter it gets colder and then plugs the filter.

I use Arctic formula Power Service in every tank during the winter and regular Power Service the rest of the time. You need the lubrication year round and the anti gel in the cold weather!