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Old 04-19-2013, 11:19 AM   #1
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Mixing used motor oil with fuel

I've heard that you can burn used oil by mixing it with diesel. Has anyone done this? Drawbacks? Does it make a difference if you run it through an older engine vs. a more modern one?
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Old 04-19-2013, 11:29 AM   #2
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I'm sure you can do it but I wouldn't do it EVER!
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Old 04-19-2013, 11:30 AM   #3
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I did this for years with my 1999 F-250 and 2001 Excursion- both had the 7.3 PSD.

I think that any older mechanical diesel wouldn't hiccup in burning diluted waste engine oil- and the greenies would have to admit that it's a good repurposing of the oil!
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Old 04-19-2013, 11:44 AM   #4
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I've heard that you can burn used oil by mixing it with diesel. Has anyone done this? Drawbacks? Does it make a difference if you run it through an older engine vs. a more modern one?
Check with your engine owners manual or manufacturer. My guess is the answer will be "No".
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Old 04-19-2013, 12:12 PM   #5
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And the upside is?
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Old 04-19-2013, 01:36 PM   #6
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And the upside is?
Very good question & the answer is••••••?
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Old 04-19-2013, 02:08 PM   #7
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Lubricity Additive Study Results - Diesel Place : Chevrolet and GMC Diesel Truck Forums

13)Used Motor Oil, Shell Rotella T 15w40, 5,000 miles used.
Unconventional (Not ULSD compliant, may damage systems)
HFRR 634, 2 micron improvement
200:1 ratio
16.64 oz/tank
price: market value
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Old 04-19-2013, 02:18 PM   #8
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Does it make a difference if you run it through an older engine vs. a more modern one?
If you have an engine built in the 1930s and lubricate it with 1930s lube oil, go for it.
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Old 04-19-2013, 03:25 PM   #9
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Lubricity Additive Study Results - Diesel Place : Chevrolet and GMC Diesel Truck Forums

13)Used Motor Oil, Shell Rotella T 15w40, 5,000 miles used.
Unconventional (Not ULSD compliant, may damage systems)
HFRR 634, 2 micron improvement
200:1 ratio
16.64 oz/tank
price: market value
This study involves ULSD and 2007+ engines- is there similar data for older mechanical engines?
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Old 04-19-2013, 03:43 PM   #10
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Greetings,
Paul Hana asked the correct question. However till there is additional confirmation and in light of personal knowledge allow me to comment.
We have in the family, several 1992- 1998 Dodge Rams with the Cummings engine, high hours. We blend in used engine oil at a good clip, maybe as high as a couple of gallons with each tank fill. There is no change in the operations except the use of old oil.
Our family mechanic and one owner is a heavy duty diesel mechanic (Warsila, EMD, and Washington to name a few he is active with) as well as a past until clear cut logging was dis-allowed with families and communities being destroyed, still suffering , heavy duty construction mechanic.
The other day he mentioned increasing the use as everything is purring fine.
Just saying he knows his beans about engines.
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Old 04-19-2013, 09:29 PM   #11
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Just saying he knows his beans about engines.
He ought to go to work for the Army, could have saved them all that expensive testing.

http://www.dtic.mil/cgi-bin/GetTRDoc?AD=ADA349754
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Old 04-19-2013, 11:11 PM   #12
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Dead link for me. Does it work for anybody else?
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Old 04-19-2013, 11:14 PM   #13
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Be patient. It is a 15.2 mb, 191 page pdf file.
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Old 04-19-2013, 11:25 PM   #14
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Northern Spy,

You were right!

Thanks!
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Old 04-20-2013, 06:50 AM   #15
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Detroit Diesel has a full report on using old lube oil in their antique (1936 design) ., written in the 80's.

Basically it ruins the cylinders and is considered a no no.

"Saving" $4.00 by dumping a gallon of filthy oil at best will require replacement of the fuel filter elements.
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Old 04-20-2013, 09:13 AM   #16
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Detroit Diesel has a full report on using old lube oil

7SE270 0510 Copyright 2005 DETROIT DIESEL CORPORATION

5.3.2 FUEL ADDITIVES THAT ARE NOT ALLOWED
The following fuel additives are NOT allowed:
Used Lubricating Oil Detroit Diesel specifically prohibits the use of drained lubricating oil in
diesel fuel. Used lubricating oil contains combustion acids and particulate materials, which erode
injector components, resulting in loss of power and increased exhaust emissions. In addition,
the use of drained lubricating oil will increase maintenance requirements due to filter plugging
and combustion deposits.
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Old 04-20-2013, 10:19 AM   #17
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the greenies would have to admit that it's a good repurposing of the oil!
Just a note on this -- in addition to the notes here about whether this is good for the engine, there is clear evidence that burning waste crankcase oil is in fact a very efficient method of adding numerous dangerous chemicals to the environment. From a local study (this was for space heaters, but the results for engines are similar):

According to the Ministry of Environment, a space heater burning used motor oil would emit 8,000 times more lead, 196 times more sulphur oxides, 128 times more arsenic and 35 times more inhalable particulate matter (PM10), than a space heater burning home heating oil.

Add to this the fact that waste oil can be very efficiently re-refined, and it is clear that the best solution is to deposit used oil in an approved location.

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Old 04-20-2013, 10:42 AM   #18
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Just a note on this -- in addition to the notes here about whether this is good for the engine, there is clear evidence that burning waste crankcase oil is in fact a very efficient method of adding numerous dangerous chemicals to the environment.
Scott Welch
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Not to mention it is illegal in the US , Canada and Europe to burn used oil motor unless done in an approved (by EPA and other regulators) facility utilizing stack gas cleaning to catch the emitted heavy metals.

As previously stated, to save $4 on a gallon of real fuel you end up ruining your engine - except in a very low mileage Alaska pickup of course.
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Old 04-20-2013, 10:44 AM   #19
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As previously stated, to save $4 on a gallon of real fuel you end up ruining your engine - except in a very low mileage Alaska pickup of course.
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Old 04-20-2013, 11:42 AM   #20
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Why would anyone run contaminated motor oil through their fuel system?
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