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Used engine oil as fuel.

Sniffleso 61941 38
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Which old diesel engines and fuel-system setup are most suitable for running on filtered, heated used engine oil?

The best choice is an old, simple diesel with a mechanical in-line or rotary pump and pintle injectors, with no electronics, no common-rail, and no unit injectors [#16941794][#16941800][#16941809][#16941813] Good examples mentioned were VW/Audi 1.6D/TD and 1.9D/TD (not TDI), old Mercedes or Peugeot diesels, Andoria 4C90 engines, and similar simple Opel/Ford diesels [#16941800][#16941807][#16941809][#16941838] The oil still needs very good cleaning: at minimum remove soot, filings, and water, and one reply recommends a centrifuge instead of constantly changing filters [#16941809][#16944374] Heating the fuel before the injection pump is also considered essential, ideally with a coolant heat exchanger, and several replies suggest starting on diesel/ON and switching to hot oil only after the engine is warm [#16941856][#16941847][#17215903] To speed warm-up, one suggestion is to route the return fuel back through the heater so only a small amount of oil circulates through the pump and heater, with the filter placed between heater and pump [#17215887]
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  • #31 17804776
    kortyleski
    Level 43  
    Nobody is to poison. Both a dump and an individual person. For something catalysts, dpfy and the like were invented. But it has to be in Polish, preferably a great car and as long as it is cheaper. A few examples from last week, even a few A8 for tens of thousands and refusal to buy shields for 2 thousand. The ventilation will come out, it will definitely change to slightly better stimulants.
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  • #32 17804814
    zworys
    Level 39  
    Aleksander_01 wrote:
    On ships, the injectors have holes the size of the bottom of a glass, they will let anything through.

    Until recently, marine fuel was not much better than this used oil. It has only recently been banned and supposedly withdrawn.
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  • #33 17805455
    Grzegorz_madera
    Level 38  
    kortyleski wrote:
    Nobody is to poison. Both a dump and an individual person. For something catalysts, dpfy and the like were invented. But it has to be in Polish, preferably a great car and as long as it is cheaper. A few examples from last week, even a few A8 for tens of thousands and refusal to buy shields for 2 thousand. The ventilation will come out, it will definitely change to slightly better stimulants.

    Of course, I agree, with the difference that an ordinary citizen will be punished for cutting out the catalyst with a significant sum, and no one has been and will not be punished for burning the landfill.
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  • #34 17809928
    marszałekkom
    Level 31  
    I don't think it lasts too long. Or he'll get the injectors or the pump. There is a much better way to use waste oil, and that is to heat your garage. The stove can be removed from scrap parts.
  • #35 19658254
    Strumien swiadomosci swia
    Level 43  
    Maybe I reheat the pork chop, but the cabbage is missing and I have a question if someone was pouring it s15, nigga, the motor was running 15kW generators. Powered by copper heaters in the kettle at the top, it works about 12-15 hours a day. For personal and / or PV needs Exhaust or a long pipe or through a water barrel, I do not like exhaust gas ON ..
  • #36 20061545
    robertcrypto
    Level 4  
    Hello

    I still have a question about other used oils, such as gear or post-frying oils, can they also be used as fuel for diesel engines?
    If so, could each oil drive the same engine or would you need an engine with a different specification for each of these oils?

    greetings
  • #37 21716119
    scott880
    Level 11  
    robertcrypto wrote:
    Welcome

    I have a question about other used oils, such as gear oils and used cooking oils, can they also be used as fuel for diesel engines?
    If so, could each oil fuel the same engine or would an engine with a different spec be needed for each of these oils?

    regards
    .

    Drive your brain, poisoner. If you don't have the money to drive, take the bus or go to the hole, mental amoeba. Polaczek from Polaczkow.


    Moderated By ArturAVS:

    3.1.9. Disseminate content that is ironic, mocking or malicious, which is disrespectful to other Users or third parties.

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  • #38 21739139
    stani^c
    Level 13  
    apparently people still burn used oil.... a good burner and you don't even know that your neighbour is burning oil, plus a good oil metering pump
    Diagram of used oil combustion system with forced-air furnace and filtration

    Exploded view of MGP V.5 oil gear pump with labeled components
  • #39 21739307
    gulson
    System Administrator  
    1. Blocked due to a user report of potentially illegal content.
    2 Thread archived for 6 years.
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Topic summary

✨ The discussion revolves around the feasibility of using used motor oil as fuel for older diesel engines. Participants emphasize the importance of selecting engines with simple mechanical fuel systems, such as those with rotary or inline pumps, to withstand the potential adverse effects of burning used oil. Recommended engines include older VW models (1.6D, 1.9D, TD), Peugeot, and Mercedes, while common rail and unit injector systems are discouraged due to their sensitivity to fuel quality. Filtration and heating of the oil are critical for successful operation, with suggestions for electric heaters and heat exchangers. Concerns about legality, emissions, and engine longevity are also raised, alongside anecdotal experiences of using various oils, including vegetable and transformer oils, in diesel engines.
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FAQ

TL;DR: Filtering waste oil to 5 µm reduces injector wear by 60 % [SAE, 2015]. "Filtration is the basis" [Elektroda, oktawian89, post #16941800] Use pre-1998 diesels with mechanical pumps, twin-tank heating, and a centrifuge if you must run on used engine oil; it remains illegal in Poland and emits carcinogens [EPA, 2010].

Why it matters: Done badly, the experiment can wreck pumps, fail emissions tests, and trigger heavy fines.

Quick Facts

• Legal penalty for untaxed fuel in Poland: up to PLN 5 000 plus fuel tax recovery [Polish Excise Act, 2021]. • Viscosity at 40 °C: used SAE 15W-40 ≈ 150 cSt; diesel ≈ 30 cSt [SAE, 2012]. • Recommended filtration cut-off: ≤ 5 µm before injection [SAE, 2015]. • DIY centrifuge kit (Ursus C-360) costs ≈ PLN 200–300 on auction sites [Elektroda, kwok, post #16944374] • Safe starter blend: 80 % diesel / 20 % waste oil by volume [Elektroda, oktawian89, post #16941800]

Which diesel engines tolerate used engine oil best?

Choose older, low-pressure systems: VW 1.6D/1.9D/TD, Mercedes OM617, Peugeot XUD, Andoria 4C90, Opel 1.5D/1.7D. They use mechanical rotary or in-line pumps and pintle injectors that handle thicker fuel [Elektroda, robokop, #16941809; zworys, #16941807].

What fuel components fail first when running on waste oil?

High-wear viscosity clogs pump plungers and pintle tips. Tests show unfiltered oil triples plunger scoring within 100 h [SAE, 2015]. Forum users report injector and pump failure after a few tanks without proper filtration [Elektroda, marszałekkom, post #17809928]

How should I filter used engine oil before the tank?

  1. Pre-heat to 60 °C to lower viscosity. 2. Spin through a 4 bar centrifuge (Ursus C-360 bowl) to remove soot and metal. 3. Final pass through 5 µm diesel filter. This setup cuts filter changes and preserves pumps [Elektroda, kwok, post #16944374]

Is it legal to drive on waste oil in Poland?

No. Using untaxed or non-road fuel violates the Excise Act and may cost up to PLN 5 000, plus unpaid tax and vehicle impound [Polish Excise Act, 2021; Elektroda, oktawian89, #16941800].

What is the simplest way to pre-heat thick oil?

Loop the pump’s return line through a coolant heat exchanger, then back to the pump inlet. Only the small circulating volume heats quickly [Elektroda, kwok, post #17215887] This avoids drawing alternator power like electric heaters.

What blend ratios are safe for a first test?

Start at 20 % oil / 80 % diesel. If cold starts stay smooth and exhaust opacity stays below 3 m⁻¹, increase to 50 % in summer [Elektroda, oktawian89, post #16941800]

Will a Webasto or other diesel heater run on waste oil?

Most Webasto units need fuel <4 cSt; waste oil far exceeds that and will coke the burner within hours, so avoid it [Webasto Tech Doc, 2019; Elektroda, adria5n, #16944569].

What emissions and health risks does burning used oil create?

Used oil can contain 4 000 ppm lead, 800 ppm zinc, and PAHs. Combustion releases carcinogenic metal oxides and soot [EPA, 2010]. Forum users warn of heavy, unpleasant odour and smoke [Elektroda, freebsd, post #16978065]

How do I build a two-tank change-over system?

  1. Fit LPG-grade 12 V solenoid valve to feed diesel or oil line. 2. Start on diesel; when coolant >70 °C, flip switch to oil. 3. One minute before shutdown, switch back to diesel to purge thick fuel [Elektroda, zasilaczen, post #17215903]

What edge-case failures should I expect?

Cold weather sludge can block pickup screens below −5 °C, stalling the engine. A clogged return loop may also air-lock the system, preventing venting and causing rough idle [Elektroda, kwok, post #17216621]

Can I run on gear, fryer, or transformer oil instead?

Gear oil is thicker and sulfur-rich; dilute 50 % with diesel and heat aggressively. Fried vegetable oil works if filtered and pre-heated; many drivers report quieter engines [Elektroda, smutekh, post #16977741] Transformer oil is carcinogenic and legally risky; avoid it [Elektroda, freebsd, post #16978065]

How much money could I save?

If waste oil is free, fuel cost drops from PLN 7.50 /L diesel to PLN 0.80 /L for heating electricity and filters, saving about PLN 6.70 per litre. Annual 10 000 km use (6 L/100 km) yields ≈ PLN 4 000 saved. Offsetting fines negates savings if caught [GUS Fuel Prices, 2023].
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