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!

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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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

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.

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.
charlie

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there were three HP ratings on the OM616...

1) Not much power
2) Even less power
3) Not nearly enough power!! 240D w/auto

Anyone that thinks a 240D is slow drives too fast.

80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works

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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FRED

Daily Driver: 98 E300TD 199K
Hobby Car: 69 Austin Mini
Past Diesels: 84 300SD, 312K
87 300SDL, 251K
94 Chev. K-1500 6.5Ltr.TD, 373K

Thank you all! Off to the recyclers w/ my oil! I truly appreciate all of your help!

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.

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.

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?

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1981 Mercedes-Benz 300SD ~285,000 Miles