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Rather than re-use fish fryers' oil, take a leaf from the book of a garage proprietor I knew. He saved oil from customer car servicing, filtered it and used nothing else for his three family cars, one business car and a breakdown truck. He reckoned it was o.k.
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No matter how well he filtered it, it's an option to avoid. If you think old diesel engines are smelly this stuff would be ten times worse - vastly more toxic and polluting than ordinary derv. Air quality in towns would be like London in the smog days. Definite MOT emissions failure as well.
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Air quality in London - or parts of it - fails all known standards at present.
Frankly I would never use recycled cooking /other oil. What you save on fuel costs is likely to be lost in gummed up injectors, coked up engines and fouled catalysts - in the long run.
And for older diesels which have fuel pumps that rely on diesel for lubrication , I suggest they may be affected as well..
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