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Old 01-12-2019, 20:23   #61
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Re: Adding Used Motor Oil to Diesel Fuel?

With Veg oil You have to mix lye into it to separate the 20% glycerine and then the rest is good but smells like french fries !
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Old 01-12-2019, 20:34   #62
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Re: Adding Used Motor Oil to Diesel Fuel?

Here's a very popular waste oil recycling machine....

Clean Burn is the world leader in waste oil furnaces and waste oil boilers that generate free heat by recycling used oil on site.

https://www.cleanburn.com/
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Old 01-12-2019, 20:36   #63
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Re: Adding Used Motor Oil to Diesel Fuel?

Or heat it to the same viscoscity. You are describing biodiesel.
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With Veg oil You have to mix lye into it to separate the 20% glycerine and then the rest is good but smells like french fries !
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Old 01-12-2019, 20:40   #64
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Re: Adding Used Motor Oil to Diesel Fuel?

Other than the carbon and any metal from engine wear it's all hydrocarbons and the heavy stuff (more hydrogen carbon bonds) will disperse into the diesel hydrocarbons (less carbon hydrogen bonds) and burn to predominately CO2 and carbon particulates. Any metal particles large enough to cause much damage to anything will most probably settle from the now dispersed, low viscosity diesel/oil mix to the bottom of the tank.

The carbon particles are no more likely to cause engine wear in excess of those present from the burned diesel since basically they are frtom the same source.
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Old 01-12-2019, 20:42   #65
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Re: Adding Used Motor Oil to Diesel Fuel?

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Or heat it to the same viscoscity. You are describing biodiesel.


You can burn straight pure filtered French fry grease, but I sure won’t.
There is no spec for BioDiesel other than Diesel engine fuel made from organics.
So you could heat and burn bees wax and call it BioDiesel.

I even ran my Jeep for a short while on Coleman camp fuel, which by the way don’t do, it must have an Octane of about 50 from the way it rattled.

Just because you can does not mean you should.
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Old 01-12-2019, 20:56   #66
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Re: Adding Used Motor Oil to Diesel Fuel?

From what I recall about straight used oil for fuel, lots of those systems heated the oil before it hit the engine to keep it thin, also they would stay away from any oil with animal products as once they cooled they’d jam up the lines something bad.
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Old 01-12-2019, 22:30   #67
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Re: Adding Used Motor Oil to Diesel Fuel?

As a 17yr old apprentice diesel fitter I had to watch a series of films on the properties of various lube oils and motive fuels, including the use of sump oil reuse. Having seen used oil magnified many times and the fine metal particles in suspension my advice is DO NOT consider it, the damage it causes to precisely engineered parts is terminal and expensive. Now being on the wrong side of 3 score & 10, I have forgotten how many times I have relayed this basic advice on to member of fishing fraternity and others.
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Old 01-12-2019, 22:52   #68
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Re: Adding Used Motor Oil to Diesel Fuel?

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Now being on the wrong side of 3 score & 10, I have forgotten how many times I have relayed this basic advice on to member of fishing fraternity and others.
But giving such advice to a Queensland prawner is unlikely to cause a change in habits, no matter how many times you repeat it!!

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Old 01-12-2019, 22:59   #69
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Re: Adding Used Motor Oil to Diesel Fuel?

Is there some particle that will pass the on engine filter (typically 2 micron) that will damage the injector pump or injectors? If that is the case then I think they'd put finer filters on engines.



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As a 17yr old apprentice diesel fitter I had to watch a series of films on the properties of various lube oils and motive fuels, including the use of sump oil reuse. Having seen used oil magnified many times and the fine metal particles in suspension my advice is DO NOT consider it, the damage it causes to precisely engineered parts is terminal and expensive. Now being on the wrong side of 3 score & 10, I have forgotten how many times I have relayed this basic advice on to member of fishing fraternity and others.
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Old 01-12-2019, 23:21   #70
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Re: Adding Used Motor Oil to Diesel Fuel?

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Is there some particle that will pass the on engine filter (typically 2 micron) that will damage the injector pump or injectors? If that is the case then I think they'd put finer filters on engines.

My guess that fine metal particles could (would?) pass though a typical diesel fuel filter. Of course the diesel you buy doesn't come with fine metal particles so there is no need for the manufacturer to worry about filtering them out .

Used oil would have metal in it for sure!
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Old 01-12-2019, 23:35   #71
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Re: Adding Used Motor Oil to Diesel Fuel?

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My guess that fine metal particles could (would?) pass though a typical diesel fuel filter. Of course the diesel you buy doesn't come with fine metal particles so there is no need for the manufacturer to worry about filtering them out .

Used oil would have metal in it for sure!
Not sure about that assumption??

Between the off-take from the fractional distillation tower in the refinery and your fuel tank the diesel goes through a plethora of mechanical pumps and volume measuring devices any one of which could put small wear particles into the fuel stream.
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Old 02-12-2019, 00:23   #72
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Re: Adding Used Motor Oil to Diesel Fuel?

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Is there some particle that will pass the on engine filter (typically 2 micron) that will damage the injector pump or injectors? If that is the case then I think they'd put finer filters on engines.

If there was a metal particle or other debris that damaged injectors or pumps, I'd know it by now. Until I recently stated centrifuging my oil, I burned my oil in mostly Detroits with mechanical injectors with many more fine tolerance internal parts than other engines. I haven't changed an injector in hundreds of hours and can't even remember the last one I changed. The last time I did a repair on an injector pump was in the early 1980s.
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Old 02-12-2019, 02:31   #73
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Re: Adding Used Motor Oil to Diesel Fuel?

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Not sure about that assumption??

Between the off-take from the fractional distillation tower in the refinery and your fuel tank the diesel goes through a plethora of mechanical pumps and volume measuring devices any one of which could put small wear particles into the fuel stream.
Makes sense; is there much filtration in the system before it reaches the retailer?


Maybe I need to rework my assumptions
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Old 02-12-2019, 03:02   #74
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Re: Adding Used Motor Oil to Diesel Fuel?

Re-refined* motor oil is currently being used by all kinds of truck fleets, municipal fleets and the U.S. military with excellent results. Re-refined motor oil is also being used in NASCAR racing and NHRA drag racing to improve their green image.
In Europe, about 50 percent of motor oil is re-refined, thanks to regulations dating to 1975 that were revised in 2008.
In North America, only about 10 to 15 percent of motor oil is re-refined. But that story is slowly changing as U.S. companies have begun to see a new market in “green” lubricant.
API-certified re-refined motor oils are available to consumers in popular viscosities under various brand names, including Green Earth Technologies G Oil, Safety-Kleen EcoPower oil and Valvoline NextGen Oil.
Welcome to Green Earth Technologies
Environmentally Friendly Motor Oil | EcoPower
https://www.valvoline.com/our-products

* "Recycling oil" or "reconditioning oil" is most commonly referring to using commercial filtration systems to remove insoluble impurities. The resulting oil has very limited uses, because of the stringent safety and environmental regulations.
"Re-refining", on the other hand, is a process that removes all impurities, both soluble and insoluble, and returns the oil to a quality suitable for several applications. Re-refining used oil uses less energy than refining from crude.
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Old 02-12-2019, 08:53   #75
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Re: Adding Used Motor Oil to Diesel Fuel?

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>>>>>>>>>>>>>>>>>>

Perhaps if people were truly caring about the environment they would have a used oil facility at marinas and fuel docks, then we wouldn't even be having this discussion.



What "people?"


My marinas in California (on Alameda) used to have used oil facilities (until they expanded b y removing the boat related stuff and building houses and condos). My marina here in BC has a place to drop off used oil and other "stuff."


It isn't a case of "doesn't everyone" but rather "why shouldn't everyone?"
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