IÂ have tried both Howes and LucasÂ Â anti-gel additivesÂ forÂ myÂ outdoorÂ 275Â heatingÂ oilÂ tank (#2). They are designedÂ forÂ Diesel fuel , yes, but #2 and Diesel areÂ kissing cousins, unlessÂ there Â is anÂ importantÂ differenceÂ I'mÂ notÂ awareÂ Â (actually Howes says OK for heating oil). They are both 100 per cent ineffective, even after following the directions exactly. The fuel still gels at about a bit below 20 F. So I've given up, and had them deliver K1 (kerosine) but they could only squeeze in 64 gallons (supposed to be 50/50 to make it a winter blend). For those of you with outdoor tanks, what do you do? Surely something must work, or theses are simply snake oils.