Whats the worst that could happen if I blended this stuff with diesel(unwashed) but started and stopped on diesel?
... that you need a new engine.
It is one thing to hope that your oil is not contaminated but to use oil that is known to contain sugar seems real silly to me. Let's see ... you probably will have some moisture of some kind in the oil and it is very likely that some of the sugar will dissolve in the oil. It will then pass through all your filtering and likely show up in the end product. If it crystallizes in the injector pump due somehow to the high pressures, you will score the pump and will need to replace it which isn't cheap. Let's say by some stroke of luck it gets to the cylinder. As it goes into the cylinder whatever water was there evaporates and the sugar crystallizes in the process. Chances are it will eventually make it's way onto the cylinder walls and into the rings and your engine will seize up in no time flat.
All of this is a guess on my part but since it's a known fact that gasoline engines get killed real quick with sugar I think I am safe with my guess. It might take a lot longer but it will happen eventually. It's really not worth the try unless you have an old beater and you need a good excuse to tell your wife that you need a new vehicle (honey, the engine seized up and it will cost too much to fix - looks like we will need to buy a new car/truck)
May I point out that blending in winter is not really a good idea unless you live someplace warm ? Now if you heat your blended fuel before it gets the pump or filter and then heated the injector lines, outside temperature would be irrelevant as long as you waited with the switch to the blend until everything is warm.
No matter how you slice things, you need to filter better than the bed sheets you talked about. I happen to use bed sheets as well but only as a pre-filter type of deal.
BTW, blending to 15% or so is ok in the summer but if you want to go higher than that you really need to heat your fuel.
I would suggest that a bit more research is in order.
Jens
Hallo Jens,
I just read your old posting and it would scare hell out of me if I hadn't burned WVO for years in roids and in our Passat and Opel TD (softturbos idi)
The oil comes straight from all kind of bars, restaurants and hotel kitchens around here and inn summer, I mostly only let it decant for a month or two an use it straight away in the roids and filter it thru a 2 my felt for the cars.Then I boil (150 °C ) the rest and filter it after some cooling.
Yes, winter is a problem since I do not separate the fats well enough but sugar has never been one.
What happens to sugar in a burning oil spray in the prechamber and in a hot engine ?
I had once a seized pump on a 6/1 after months of uncautious leaving old unfiltered frying oil in it over the summer and part of the winter, but some WD 40 and light taps with a tool resolved that.
Can I only have been lucky over all these years ?
Rolf
Yes I