I worked on engines when this kind of BS started. I worked in a logging clamp and they brought in a large set up to put the waist oil back in the fuel tanks. We are talking about 12V Cummings and Detroit's with injection pressures about 20% of what they are today. This set-up had two 750D luberfiner filters, they are a bypass filter, and had limestone in them to get rid of any acid build up in the oil. The set up used only the oil from the oil pan nothing from the filters, on the Cummins there where three primary and one bypass. The Detroit's had two primary and one bypass. They would drain the oil out of the oil pan into a large bucket, dump it into the holding tub, put the two hoses into the fuel tank, start the pumps and they would extract about 10 gallons of oil and mix it with 10 gallons of fuel then it was pumped threw the two bypass filters for about an hour. then it would put it into the fuel tank. Draw in more oil and fuel at about 50/50 the 849 Kenworths had about a 300 gallon tank for fuel, they both got about 20 gallons of used oil, when the hole thing was all done. Within a month we were having major injector problems with both the Cummins and the Detroit's. They kept it up for about 45 days so the went threw about 1/2 the trucks before they gave up on it. The injectors of that time had an opening pressure on the Detroit's of about 350 lbs and the Cummins where the early Pt's, Just a pointed plunger and two orifices. I worked for years replacing injectors and Pt pumps that failed. Anyone that tells you used oil is an option is "full of it" PLAY SAFE!
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