I don't prefer all in ones when there is no need for anti gel as d1 is so good these days. I'd look at sulfur alternatives IE lubricity products and injector cleaners if it were me. Are you using d2 at all? If not either of those products are a waste.
After adding, I had two really cold mornings and the truck started easy. The whole tank with Polar added, the truck ran great. I suppose it is hard to tell what it is doing without opening up the engine. But I'll continue to use as it sure makes cold starting really easy.