U have my attention

Centrifuges are standard equipment on the paccar mx engines

Google Diesel Craft, they have various spinner type centrifuges, for sale.

So I'm gonna guess the rest of the world also doesn't have the extra cash to spend on elaborate filtration systems. :humm:

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The smiley face was located differently in Dieselstinkr's original post, my editing missed removing it.

diesels running waste motor oil as a fuel
 

i own a dodge ram 12 valve cummins and use the waste motor oil. i have to say it runs better on waste motor oil than diesel. the only problem about black diesel is that you have to let it settle. when i first started making black diesel i use a 1 mircon filter and filtered the used motor oil 5 times through the 1 mircon filter. than i added things in it to thin it, to take the water out of it and to boost the cetane level. than i put in a 5 gallon bucket to use. after about 1 good week i noticed black heavy oil on the bottom of the bucket and my stomach turned. all that work for what slime at the bottom of the bucket. i then i thought, let me let the black diesel settle for about 2 weeks. than i took off the top and put it in another container and got ride of the other heavy oil on the bottom of the container. than allowed the good stuff to settle for another 2 weeks. there was still stuff at the bottom but nothing like there was in the first batch. than i repeated the process and let it settle for another 2 weeks. same thing but less this time and finally agian for anther 3 weeks and the bottom was clean. to summarize this point. it is important to let the brew settle because if you don't that black sludge is going to build up on the bottom of the fuel tank and be nasty. you want clean oil at the bottom, if you can see the bottom of the bucket the oil or black diesel is ready to use. i hope this helps you guys. good luck from cummins

What are you guys using for a pump to pump the used oil through the filters?

I use a 3/4 in water pump from harbor freight

the core of the earth:tu:

filtering waste motor oil into black diesel fuel
 

i think the best way to filter is by gravity for one its a free movement of liquid and two it wouldn't force small particles through the filter. i first use a 10 micron filter and than a 5 micron and finally a 1 micron filter and filter it 5 times through that filter. it takes a while but it is worth the wait. than after you put your additives in, let the brew or black diesel settle for a minimum of 2 weeks and pump off the top and get ride of the bottom. than have the top settle for another 2 weeks and do the same that should be enough settling. than use a test sample. pour the brew in a water bottle that is dry and pull off the fuel filter on the motor dump out the diesel and pour in the black diesel that you just made and spin it on the motor and crank the truck or diesel car. if the truck starts great remember that recipe for the future. if it don't work have to go back to the drawing board and start over. but remember this. if the drew you made is the sample thinkness and is flows the same as diesel thats its fine. just dump 4 gallons of your brew ina a 5 gallon bucket, add a gallon of diesel and get cetane booster. that should do the trick. mix the liquid allow for the diesel and cetane booster to work for about a week and retry. i hope that solve some questions from your pal cummins

Thats a lot of work I dont think there is a need for all that just my 2 cents