I have a fried who runs his older Nissan Navara on a blend of 20% diesel and 80% auto transmission fluid. He has an agreement with an auto box repair shop to take all their used oil. He gravity filters it first from one 200L drum to another through a filter bank, and then centrifuges it so that it is clean for the engine. A bit of work involved but it makes cheap fuel.
My brother was working for a lubrication company a few years ago, and they had an 'incident' where 2,000L of lubrication oil that was being batch blended for the coal mine at Huntly, was incorrectly blended with additives. Oil was toast. $10k worth of oil !! I managed to get if for nothing, including two brand new IBC's. Mate was a very happy chappy as it was a light grade oil and suitable for his Nissan.
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