Anyone ever tried to mix used motor oil in diesel fuel?? - Ford Powerstroke Diesel Forum
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Old 11-25-2007, 05:48 PM
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Anyone ever tried to mix used motor oil in diesel fuel??

I have run accross a guy who works as a service manager for Peterbuilt , and he states that instead of having a holding tank and storing used motor oil they drain it, run it through a machine that has a tube that sticks into the fuel opening on the tank and draws fuel from the tank and mixes with the old oil. It runs through a 6 micron filter 2 times before it is just pumped back into the fuel tank to be burned as fuel. Anyone here ever heard of this?? He states that it can be mixed up to a 60% fuel 40% oil mix with out anything done at all. If this is true then I may try this -- as much fuel as I burn in a week this 40% free fuel ( service manager at a local mechanic shop for years , and they pump 300 gallons of used oil out a week) so, if I can tap into this free fuel I would save a bundle and maybe able to stay in business for years to come. Just a thought that I wanted top ask you guys opinion on-- but I did put 30 gallon of filtered oil in my 01 7.3 today and I am going to run it tommorrow, and I will let yaw know how she does, on the $98.70 worth of free fuel. I hope all goes well ........
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Old 11-25-2007, 06:21 PM
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It will work but it will put off some nasty, nasty pollutants in the air. Research it before you do it.
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Old 11-25-2007, 06:23 PM
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Old oil on today's diesels is bad news all around.There is way too much contaminants in the old oil. Yes it does burn and will create more soot thus cause more regen cycles, wear out your fuel system prematurely, plug your filters and void your warranty. If your oil is black, (which it is) that is carbon and carbon is an abrasive and will kill you fuel system quickly.
And also if you operate in cold climate, it will be way too thick to flow properly.
Sorry for my negative input but stay away from anything but an approved conditionner.
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Old 11-25-2007, 06:31 PM
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i put some in mine one time i hate to tell you it is not free it is rough on the fuel pump and filter much less the injecters
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Old 11-25-2007, 06:56 PM
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Not to sound harsh but that could be the dumbest thing you could do to a piezo injected truck.

Please don't do it!!
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Old 11-25-2007, 07:19 PM
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I have not thought of this in the 08 ,but I am going to try in my 01 7.3 though. I will let you know how it goes.
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Old 11-25-2007, 07:22 PM
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Still not a good idea, as the Injector tips will for more carbon on them. The result is more damage then good.

It's much safer on a mechanical engine. IE 6.9, 12 valve cummins.
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Old 11-25-2007, 07:27 PM
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the guy form the pete shop said, that oil is only one step from diesel fuel anyways, so thats why the program exist to introduce it back to the tank with the right mixture. If it will work on these engines ,why will it not work on this one? And one more thought was that since the 08 has not got a DPF anymore can I use regular diesel fuel instead of the higher priced ULSD?
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Old 11-25-2007, 07:36 PM
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I'm not sure if the Pete service Manager is real familure with the 7.3. Maybe you will get some advice from some PSD techs such as marc or Scuffy. I've been doing this longer than I can remember and it's never proven to do any good or save money.

Have you priced injectors for your 01........I'll help 2400.00+ 1500.00 core charge= not worth used motor oil. Buy some Powerservice atleast and get some gains and protection in both trucks.

As for fuel for the 08, the DPF is not the only item affected by 500PPM fuel. I would continue running 15PPM Ultra low sulfer.
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Old 11-25-2007, 07:39 PM
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what else may I ask is affected?
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