You need on-board heaters to run a VO fuel system, though some evade that requirement in moderate climates by mixing the oil with other fuels (not "treatments", but kerosene, gasoline, or others). Someone did a thorough comparison of additives and various fuels' cold-weather performance at a range of temps. It's exactly the info you probably need. I'm sure Google will yield it fairly quickly. Try "diesel fuel cold weather performance"

If you have adequate, well-designed fuel, fuel line, filter, and block/coolant heating systems on board, you should not need additives,

This is particularly true in a climate such as Boston's. And you're likely to spend real money on all that heating, whether in the form of electrical, fuel, or auxiliary heating system fuel (Espar, etc.)

Since you'd likely have to perform many of the same of mods to run untreated bio in a cold climate, makes some sense to skip the refining step and just burn oil. But the conversion is a LOT of work regardless.

How cool is too cool is completely dependent on climate and type of oil.

For example, running coconut oil in your diesel in Boston in the dead of winter will *REQUIRE* some *SERIOUS* modification of your vehicle before you could even think about getting combustion to happen, let alone on a regular basis.

Heres the diesel secret.

Just about anything that is combustlble under pressure will burn in a diesel engine. If you add benzene to cat hair, brick dust or even water, you will get combustion. The diesel secret energy stuff is just a bunch of benzene products mixed in with a bunch of hydrocarbons [ which would be the opposite of what you desire] that will make human flesh, pets or just about any flammable substance combust in a diesel engine.

I don't recommend additives or solvents for anyone considering running WVO/SVO/PVO or whatever you want to call it. Every, and I mean EVERY batch of oil is going to have different lubrication properties than the last. Their is no magic elixir of percentages that you can mix together that is going to magically apply to from one batch to another .

Why do I speak this nonsense?

Well because its the truth. A diesel engine will run on fat from liposuction if the viscosity is near correct, but that doesn't mean its running good or proper or within design specifications. Newer diesels are obviously more susceptible to these problems than older ones, but none the less if your going to commit to renewable fuels you need to understand the risk and trials you may experience.

Currently their is no "STP" treatment that will apply to WVO (waste veggie oli) and make it into biodiesel.

Biodiesel is the result of seperating burnable oil from glycerol.

Glycerol is a usable product, handy for making soaps, toothpastes, gauge oils and a handful of other products handy in making civilized life available to you and me. In a engine under improper circumstances it can cause problems akin to clogged arteries in your dad. Left in old use up oil it creates nothing but problems, problems even "diesel secret" cannot address.

BQ9000 diesel will run in any diesel easily made within the last 10-15 years at almost any percentage of diesel and bio. Dirtier bio-d will create problems for just about any diesel.

I'm being brief here, but the short work of this is their is no biodiesel secret. Only a secret of how shady folks can take advantage of others.