Wayne and Richard, you're both correct. Richard I'm glad you had the diesel polished, for peace of mind. That didn't hurt a thing.
Wayne, you're also correct that quality diesel fuel will last for years.
Where the problem lies is when operators will use 'bio-diesel' the mucky algae loves that stuff! In a few months the junk starts growing and it clogs filters and can foul the tank and fiel lines.

Engines run great on bio-fuel but it can't sit long. You find it mostly sold at truck stops. marina's use the good stuff for that reason...