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I would recommend putting 1% kerosene based white spirit or similar with the oil. 50% mix would certainly be fine. I think Diesel has a few added beneficial additives, so you don’t want to lose to much of that.
Heating oil is not a bad option, it's basically the same as diesel, but less tax. It's less likely to congeal than Vegetable oil. But then, I’ve got a big oil tank outside for heating the house. It’s less work than disposing of my friends waste chip shop fat. But maybe more expensive.
I would recommend putting 1% kerosene based white spirit or similar with the oil. 50% mix would certainly be fine. I think Diesel has a few added beneficial additives, so you don’t want to lose to much of that.
I assume 1% white spirit is only if you are using 99% oil in the tank?
So 75% oil and 25% diesel will be ok?
It was just out of interest to see how well it ran - that is why I wanted to know if there was any specific problems with the Audi TDI engine
That's right Doug.
You could always add a small amount first, to check if your TDi likes it. Then slowly step up the mixture. See how it runs, smokes, performs, etc.
I might try it then - I see you can get tank heaters and preheaters but this must be for crap oil that goes gloopy when cold. I might experiment with some "safeway savers" to see if I notice any differnece in performance etc.
My mate chucked veggie oil from the supermarket in his Pug 206, and ran it for a while with a few large containers of the stuff, never having much in the way of problems but he did say it smelt like a fish shop. I think if you mix it with diesel (he ran mostly diesel, but chucked this stuff in when he was skint, so 50/50 at the most) you should be ok.
If it didn't blow a French car up a German car should be fine but reading up on the subject is always good. His car was a 2.0 hdi 90hp, so fairly modern, not sure if that makes a difference.
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