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Old 06-11-2007, 09:35 AM
1982 240D
Join Date: Sep 2005
Location: Winston and Salem, North Carolina
Posts: 32
Quick question re used motor oil

I've recently changed the oil in my '82 240D. So now I've got about 5 quarts or so of USED oil, and thought that, instead of taking it to my local hazardous waste recycling plant, I'd dump it in my tank and dispose of it while driving. I've seen on this forum that used oil can be put in the tank.

I'm planning on using a quart or two of the oil each time I fill up so as not to introduce too much oil at once.

So, here's my question: does the used motor oil have to be filtered before dumping it in the tank?

If so, how would y'all suggest that filtering be done?

Thanks in advance for your help!

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Old 06-11-2007, 09:37 AM
vstech's Avatar
Join Date: Mar 2006
Location: Mount Holly, NC
Posts: 26,520
don't do it, hazordous to the environment, your health, and your car. you can't filter it well enough to get the fine particles out. just recycle it at your local parts house.
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Old 06-11-2007, 12:01 PM
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It's not meant to be fuel. It's illegal, bad for the environment, bad for the engine, hard on the injection pump and will also make your exhaust smoke blue.
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Old 06-11-2007, 01:42 PM
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Join Date: May 2007
Location: Out in the Boonies of Hot, Dry, Dusty, Windy Nevada
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I remember back in the 80`s I think it was, that coors was taking their used oil from the big rigs and running it through a series if filters.
If I remember right, they mixed it at a 5% ratio.
back then with fuel prices getting up the $1.00 range ,
well I don`t know where that went, but is most likely not being done today. with the epa etc...
but then it is being filtered by our fine German filters on the lower end
of the engine.
probably have to do an oil analysis to see what is in the oil, like anti freeze etc... then that would exceed the cost of a gallon of diesel any way.
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Old 06-11-2007, 01:52 PM
F18 F18 is offline
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Join Date: Oct 2005
Location: Massachusetts
Posts: 677
As mentioned by Lance......engine oil with all the additives and detergents (especially 15W40 diesel engine oil) would be harsh on the injection pump even if you filtered it before hand to get the particulates out before it passes through your fuel filter.
The last time I looked a rebuilt IP for your model was about $900 to $1000....a good used one $500. Not worth the risk! Take the oil to a recycler........

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Old 06-11-2007, 03:20 PM
1982 240D
Join Date: Sep 2005
Location: Winston and Salem, North Carolina
Posts: 32
Thank you all! Off to the recyclers w/ my oil! I truly appreciate all of your help!
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Old 06-11-2007, 03:23 PM
Posts: n/a
That's good. It will likely be burned in generators, heaters, or special vehicles designed to burn used oil.

The Union Pacific Challenger and the Eureka Springs steam engines, for example, burn used engine oil.
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Old 06-11-2007, 04:58 PM
Join Date: May 2004
Location: Varies
Posts: 4,802
I try to give mine to someone who will burn it for heat. My informed opinion is that it is not worth burning it as automotive fuel.
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Old 06-11-2007, 05:53 PM
jap jap is offline
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Join Date: May 2007
Location: Little Hocking, Ohio
Posts: 45
I've used it before in the tank just to see what would happen. But diesel used oil has so much stuff in it that it plugged my filters up within a few hundred miles. At about $12 a pop, it wasn't very cost effective.

How about new motor oil though?

1981 Mercedes-Benz 300SD ~285,000 Miles
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