rattle_rattle

Has anyone done this? I read a fuel specification from Cummins awhile back that mentioned using a certain percentage of used oil mixed in the fuel tank. I would hope that they filtered it good! If this could be done, it would be great. No disposal issues and free fuel. I have a setup where I can recirculate oil through a standard oil filter from a container. I wish I had the nerve to put some in the tank to try it!

DF5152

i remember reading about this somewhere on the net. i thought it was cummins but i have not been able to find it again. there were special strainers and filter that were used and the ratio if i recal correctly about 5 gallons of oil to >250 gallons of fuel

Monty

You can spec the N14 with the Centinel system. Which is what you guys are talking about. It sends a small quantity of used oil to the fuel tank and adds the same amount of new oil. I cant see any gain with this system unless you wanted to have longer drain intervals.

dsldan

I have been using the used oil in the fuel tank for 85k miles in my 99 so far with no side affects. I usually add 1-2 Qts every other fillup. I do make sure to keep an eye on the fuel filter replacement schedule.

HeberRam

Why?????? I would never, or do I believe Cummins would say it is ok to put motor oil new or especially used oil and mix it with the diesel fuel.. ??? ??? The fact that you think your oil filter has removed ALL contaminats, supended metals, acids, soot, and detergents and putting it back in your engine is crazy. All it would take is a small piece of containment to bypass the fuel filter screw-up the injection pump and if real lucky plug an injector. The extra work placed on the fuel filter, is not cost effective for the proper disposal of used oil.<br><br>Steve

cp

It's addressed by Cummins in their Fuel for Cummins Engines Service Bulletin. To make the EPA happy, though, with low sulfur fuel, the oil/fuel mix cannot exceed the sulfur limitations for low sulfur fuel. Cummins recommended maximum mix is 5%.<br><br>Cummins also expressly states to NOT blend oil with fuel for the B or C series engines because they have catalytic converters.

Commatoze

[quote author=Monty(OkieBroncRider) link=board=8;threadid=15926;start=0#149829 date=1055784024]<br>You can spec the N14 with the Centinel system. Which is what you guys are talking about. It sends a small quantity of used oil to the fuel tank and adds the same amount of new oil. I cant see any gain with this system unless you wanted to have longer drain intervals. <br>[/quote]<br><br>...and the key here is that it's continuously sending a small amount of used oil to the fuel system, and replacing it with fresh lubricant, not stuff which has been circulating for the last #,000 miles.

rattle_rattle

[quote author=HeberRam link=board=8;threadid=15926;start=0#149898 date=1055799201]
Why?????? I would never, or do I believe Cummins would say it is ok to put motor oil new or especially used oil and mix it with the diesel fuel.. ??? ??? The fact that you think your oil filter has removed ALL contaminats, supended metals, acids, soot, and detergents and putting it back in your engine is crazy. All it would take is a small piece of containment to bypass the fuel filter screw-up the injection pump and if real lucky plug an injector. The extra work placed on the fuel filter, is not cost effective for the proper disposal of used oil.

Steve
[/quote]

Well, I could be crazy, who knows, but Cummins has had the same crazy idea. Here is a quote from Service Bullitin 3379001-07, that I am refering to:

&quot;Used engine lubricating oil can be blended with fuel using the Cummins Lube Oil Blender, Part Number 3376317 (110 volt, 60 Hz) or Part Number 3376362 (220 volt, 50 Hz). This process can be used to supplement fuel supply as well as provide a means of disposing of used lubricating oil. To blend used engine oil with fuel, follow the instructions provided with the Cummins Lube Oil Blender. Two rulings by the United States Environmental Protection Agency (EPA) affect the practice of blending lubricating oil with diesel fuel in the United States. First, on September 10, 1992, the Office of Solid Waste of the United States Environmental Protection Agency determined that used lubricating oil was not classified as hazardous waste. In addition, the blending of used lubricating oil with diesel fuel for burning in diesel powered vehicles was determined to be an acceptable method for disposing of used lubricating oil (57 Federal Register, R 41583, September 10, 1992). Second, beginning October 1, 1993, diesel fuel used in motor vehicles, as defined by the EPA, in on-highway applications must contain less than 0.055 percent sulfur by weight (Mandated in Section 211 of the 1990 Clean Air Amendments; 57 Federal Register, P. 19535, May 7,1992). Fuel blended with lubricating oil must also meet this specification. Cummins allows the blending of lubricating oil with fuel used in their engines, except those equipped with an oxidation catalyst, often referred to as a catalytic converter (such as 1994 M11’s and 1994 C8.3’s used in urban transit buses, and 1994 B5.9’s and C8.3’s used in automotive applications). Cummins permits a maximum of 5 percent used lubricating oil to be blended with fuel. This helps to reduce operating costs and aids in the disposal of used engine oil. The blending of new lubricating oil to raise viscosity is also permissible. This helps to increase the viscosity of lighter fuels to acceptable levels. Cummins’ recommendations for the blending of lubricating oil with fuel used in its engines have not changed; however, if blended fuel used in motor vehicles, as defined by the EPA, in on-highway applications exceeds the maximum sulfur content, United States federal law has been violated and penalties can be assessed. To be sure that blended fuel complies with the law, the following procedure must be followed. Both the diesel fuel and lubricating oil must have their sulfur content measured by a qualified laboratory using the testing method specified in ASTM D2622 (American Society of Testing and Materials Standard, or ISO 4260). Once the correct blend factor has been determined, multiply this by the volume of fuel to be blended. The result is the amount of this oil that can be blended with this fuel and remain within legal limits. Similar restrictions and processes must be followed worldwide where regional or national regulations can impose such sulfur limits. As an example, consider 50,000 gallons of fuel with a sulfur content of 0.04 percent by weight and lubricating oil with a sulfur content of 0.5 percent by weight. Of this oil, 450 gallons can be blended with 50,000 gallons of this fuel and remain within legal limits for sulfur content in the United States. Margins must be allowed for measurement errors.&quot;

rattle_rattle

[quote author=Gary - KJ6Q link=board=8;threadid=15926;start=0#150070 date=1055822000]<br>Well then, I guess the 12 ounces of ashless 2-stroke oil I add to 50 gallons of diesel fuel for additional lubricity won't be a problem then... <br>[/quote]<br><br>Do you really do this?

bulabula

Its not a crazy idea. I remember reading about this a while back; and wonder how that lube oil blender works - filters out most of the contaminants? Cummins Power Store will sell them for $2000 so its certainly not cost effective for an individual. <br><br>Dsldan, how do you filter that used oil prior to pouring it in the tank?<br><br>

SjLingenfelter

Will adding the oil make it smoke more? Im not really following so if this is a stupid question than ignore it. Thanks<br><br>SD03

SjLingenfelter

So let me get this straight. You can add used oil to the fuel to help with the viscoticy? Also what kind of oil like motor,trans,rearend,etc? TIA<br><br>SD03