Is diesel fuel as vulnerable to going bad as gasoline? If so, what products should be used to prevent diesel fuel from going bad?

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1989 300CE

If it sits, then yes. I have been told Sta-bil works for either, but I have yet to use it myself.

Diesel fuel is susceptible to critter infestation if left for long periods of time where there is an atmosphere/fuel interface. Such as a not full fuel tank. Condensations builds on the tank walls, drops/slides down on top of the fuel = a welcome habitat for microbes.

I would use a biocide, also, some fuel stabilizers work with diesel fuel, I would think.

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83 SD

84 CD

Startron as needed. 2-stroke oil 1oz/gallon since diesel is so dry these days.

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85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do.