You need to filter waste veggie oil (chip shop oil) VERY carefully and thoroughly before use, otherwise you'll clog your engine up in no time - burnt bits of fish and chips don't pass through engine filters or injectors ery well! I use fresh supermarket oil- ideally sunflower - in my Ssangyong. Runs fine at 100% above freezing (70-30 veggie/diesel in the colder months), although periodically run a half-tank of diesel in "just in case", normally when there's no veggie-oil deals going on.