I don't know how far east or west Blain's goes, but $5.60 per gallon is a pretty hideously low price for a reputable diesel oil, and I would call Mobile Delvac reputable.
I have some recent relocation coming, or else I'd be stocking up like a doomsday hoarder
https://www.farmandfleet.com/sales-flyer/
I have some recent relocation coming, or else I'd be stocking up like a doomsday hoarder
https://www.farmandfleet.com/sales-flyer/