Interesting article, almost sounds like they were trying to sell something....How Long Does Diesel Fuel Last In Storage?
One of the costs that has to be factored in when dealing with any sort of transportation work is fuel. The large fluctuations in diesel fuel prices - especially in recent times - many choose to buy in bulk, storing the fuel they need for their trucks on-site, yet even this has a cost attached to it.www.goldeagle.com
Old diesel with sulfur may have been different. Not to say you can't still use it, I wouldn't be running it in a common rail diesel.
I have a 1086 international I don't use much. Fuel is two to three years old. Runs nice but starts hard. Any additive I can ad?
A lot of diesel today is from cracked stock. Yes diesel can go bad from oxidation forming gums.no such thing as old deisel, if running hard don't clean up tinker with pump timing
Diesel kleen is some good stuff.On diesel fuels that age I would suspect gum formation due to oxidation. Different crudes are better or worse from different regions of the world.
I would use what's in in to kill weeds.
As already suggested replace the fuel add some Power Service diesel kleen and run it.
If it's still hard cranking I thinking injection timing.