Heed the advice on the cover of the Hitchhiker's Guide to the Galaxy and don't panic, at least not yet. Or, maybe just panic a little on the inside, but maintain your calm demeanor on the outside.

Water and diesel fuel don't mix. Although all diesel grades contain a minuscule percentage of water from the refinery, moisture in the diesel tank won't cause problems until the water content reaches ...

Yes, diesel can go bad over time, just like gasoline when it sits for too long inside your car. Typically, its shelf life is anywhere between six and 12 months, which is twice the usual rate of ...