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Used engine oil

  1. Oct 25, 2008 #1
    Hi to all i would like to ask is there a way of getting burnt carbon out of the used oil i have tried all i can think of but still cant get it all out is their a bleach or some thing i can use
    please dont tell me about the old trick with a rope it takes to long

  2. jcsd
  3. Oct 27, 2008 #2


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    You can extract it with an aqueous solution of sodium silicate (42 baume) diluted somewhat. The carbon will go out with the water.
  4. Oct 27, 2008 #3
    Re: used hydraulick oil

    hi thank you will try the sodium out,
    what about used hydraulick oil will it work the same or is their something else that will clean it
  5. Oct 27, 2008 #4
    Just removing the "burnt carbon" will not make the oil suitable for use in an engine again.
  6. Oct 28, 2008 #5
    yes i know this i do make biodiesel , and have a centralfuge and all the filters but the rest of thining it out for use hydraulick oil at a 50 50 or running by extra heater no problem but still cant get the black or brown stuff out not even at over 5000 r.p.m i am an engineer so i made my own machines up but i am no Genius nor perfect at this cleaning oil lol

    sodium silicate may do the job but at the moment i am still trying to get some with out any luck. I have an endles suppley of hydraulick oil to keep me going for a long time so i do want to waste it. so if anyone out their know were i can get some sodium silicate in derbyshire please let me know
    Last edited: Oct 28, 2008
  7. Oct 28, 2008 #6


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    Pottery shops usually have some around to make 'slip'. It is sometimes called 'egg preserver' silicate.

    Hydraulic oils have lots of detergents and high pressure additives. I wouldn't try extracting it with any caustic (unless you like mayonnaise...). Some hydraulics oils are ester based rather than light petroleum oil based and would react with sodium silicate.
  8. Oct 28, 2008 #7
    Thank you chemisttree for the advise i will try it see which one does the best job making a nice filtering tank wash and bubbles bath all in one
    at the moment i mix it with boidiesell and normal diesel to thin it out it seems to work well full tank every week lol
    anyway all the best mate to you and family will talk soon.
    i shall feel better if i can clean it as well lol
    my msn is tripleinktattoos@hotmail.co.uk also my email
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