I used to pour it in during my oil changes in my IH gas engines every now and then to help clean up sludge. It's been years since I've used it and I decided to buy a quart the other day when I was at the store. I ended up spliting it up between the fuel tank and the oil.

The outside of the can states it good for diesel fuel...whadya think?

 

I don't know if it does anything good, but it won't hurt anything. Half a can in 3 gallons of motor oil isn't a big dose compared to what a gasser gets. As for the fuel, Cummins says you can burn up to 5% waste motor oil by volume in your fuel without harm, so half a can of MMO ain't nothin'. I know the stuff has some detergents in it, and it will add some lubricity, it's probably not a bad diesel additive except that it might decrease the cetane a little. No worries, use it if you like it.

 

[quote author=wannadiesel link=board=9;threadid=21208;start=0#msg199074 date=1066697497]
I As for the fuel, Cummins says you can burn up to 5% waste motor oil by volume in your fuel without harm, so half a can of MMO ain't nothin'. I know the stuff has some detergents in it, and it will add some lubricity, it's probably not a bad diesel additive except that it might decrease the cetane a little. No worries, use it if you like it.
[/quote]

Are you saying I can add as much as 1.5 gallons of used motor oil in my tank per fill up? 30 gallon tank.

 

Cummins used to have, and may still have, what they call a Centinal System. Basically all it did was send a certain amount of used oil thru a filter then straight to the fuel tank and add new oil from a tank under the truck electronically. However, if you plan on doing this I suggest you filter the oil extremely well. One little shaving of metal smaller than what your fuel filter can filter out will do alot of costly damage to your pump and injectors.

 

Here are a couple of threads where this is discussed, the first one has a quote from Cummins stating that up to 5% is OK by them. Monty is right about filtering it, you want that stuff particle free. It's not worth screwing up a $1200 injection pump to save 1.5 gallons of diesel. The oil does lower the cetane rating of the fuel, so if you live in the frozen North (Canada, Minnesota, etc., eh?) this might be better saved for the two months when you can't see your breath.

https://www.dieseltruckresource.com/...=15926;start=0

https://www.dieseltruckresource.com/...=19146;start=0

 

I made a contraption from about $20 worth of PVC, odds and ends, etc. that is now hanging on the wall in my garage filtering all our (what used to be) waste oil for burning in the CTD. It uses a roll of toilet paper for the filter element and gravity does all the work. Takes about three days to filter a gallon in cool spring weather, probably faster in summer.

I figure it is mostly just another measure to defend the VE against ULSD. I'll post pics and assembly tips if anybody's interested.

No more trips to the hazardous waste disposal collection point for me! Well at least alot less...

 

I wonder if the 6.9 / 7.3 IDI guys could burn this 5% amount also?

 

I'd be interested in a picture/assembly tips if its not too much trouble. So are we talking all weights of waste oil and limited to just motor oil?

 

yes please!

 

Probably. It's only trucks with a catalytic converter that shouldn't mix any oil in at all.

 

I Use It In All Of Our Trucks (Fuel Only) Works Great !



TB

 

http://66.17.171.114/PhotoAlbum/Cars/Pics/Filter.jpg

I'm not a plumber so I don't know how they size PVC, but this particular size is about 4 1/2" ID and a perfect fit for a roll of Scott 1000 TP. It sits in the section about midway where it is clamped together and holds about a gallon. The sections are joined for the most part by strips of sheet metal and JB weld. The part where it seperates just isn't glued and is dimpled into some small nicks so it won't come apart when clamped. A bead of RTV around the inside of that joint seals it. I suppose you could use just about anything to make something like this, even much bigger if you needed it, as long as you get it necked down to flow through a snug fitting roll of TP.

I'll change it when it either stops flowing of after about a year or so whether it needs it or not, depending on how much I put through it. That part is still all guesswork at this point. It is likely the oil coming out the bottom is cleaner than new oil from the jug, particulate-wise. I save the gear oil for oil cans to use on bike chains, hinges and stuff like that anyway, but everything else that comes out of the various vehicles and other equipment around here, motor oil, ATF, tranny oil, power steering fluid, whatever, is going through here and then eventually into the CTD fuel tanks from now on.

 

There are several guys over at Oilburners that are burning not 5%, but 100% waste engine oil.

I have done it in both the old 6.9 and the Cummins.

I can't tell any difference in power or performance between it and diesel, it just smokes a little more and smells kinda like it's burning oil; but, then, I guess since it is burning oil, then it should smell like it's burning oil.

 

Wonder what fuel filters look like after a tank of the raw....

 

Last month I was lookin at a diesel magazine and it had an article about diesel additives. The top three picks they tested were, Stanadyne-Power Service and Marvel Mystery oil. Cant really recall, but like most articles, in the end the lubriticity for the pump was most important and they all kept things clean inside.