This may or may not be good for the engine. I am hearing more VP44 failures than ever lately, and I can't but relate it to the dry ULSD. It is a good idea to add oil to the fuel, most people agree. It is just adding 2-cycle vs adding WMO that is bugging me. I am adding 2-cycle myself and it does smooth out the injection pump rattle.
-P

 

if i was only going to run 1-5% wmo it would not pay for itself in savings i'm burning 70% because it works in my IDI & it saves enough to make a very noticable $ benefit.

 

I used to run wmo 50/50 in my gmc diesel. I would filter it to 2 microns. It worked great. I do not dare to do it in my dodge. The vp-44's have a hard enough time working with the fuel they were designed to run.

 

I would not risk my Cummins doing it. But it's your choice.

 

I would not "risk" it if I understand that there is a risk. What is the risk exactly? If it is filtered, it is just oil as good as any other lubricant, to burn in the diesel engine. Please tell me what the risk is related to?
-P

 

Engine oil still has "additive package" left. I think it may have been ok in the "day", but so was ATF. I'm not "risking" used oil as my fuel, or part there of. JM02.

 

With a quart or two of atf in the tank? how could that possibly matter? Like someone said, that would be more along the lines of an additive, not a fuel substitute. What about MMO, which is sold as a fuel additive? i can't belive that there wouldn't be a way to prove that it wasn't offroad dye.

As far as I ever heard, Cummins approves of up to 5% waste motor oil in the fuel. If the manufacturer can approve it, I can't believe that it would be harmful in those amounts.

 

Never put ATF in your tank. MMO shows no color. To my knowledge they do a chemical,not a color test, anyway.

 

even filtered it's still BLACK, though the stuff i get from fork lifts is not near so dark.

 

You'll find out about the first time they dip that tank and it comes out the color they are looking for. They may prove it is only ATF but I don't want the hassle of sitting there waiting for them to prove that and everything that goes with all of that. Also, there was a pretty good thread on here a while back about why you should not run ATF in the tank. It had something to do with the additives and such and the properties of it being hydraulic fluid.
Anyway, it's your truck so pour away bud.............

 

If it would benefit the already weak VP44 we have, I would do it in a minute but I see nowhere in the service manual where it says it is OK to run waste oil in the fuel system in these engines. With as many vehicles as I have on the road, I would sure do it if there was no harm and only benefit but I have not seen that yet. Maybe in the older engine but till I have proof, I'm not going to try it in this one.

 

you guys are uptight about these trucks.

i filtered mine thru an old t-shirt over the funnel.

it's CLEAN coming out of the motor, and at worst, it has diesel fuel in it from "cylinder washdown" at normal idle.

i don't think the % is significant if you put a quart in 34 gallons of fuel.

the general consensus from threads on this over the last few years has been the 03/04 engine mounted lift pump would NOT live without significant lubrication.

my understanding is the ULSD has less lubrication than old fuel,
so you NEED something in there to lube the fuel system, so that it has a sheen of lubrication with the parts operating at such high psi.

the higher the PSI in the fuel rail, the more the parts will wear if not lubricated.

 

To add some fuel to the fire....

My future father in law has been running 100% used/filtered ATF in his superduty for a year or so now. There is a definate power drop but not so bad that it affects his towing. The truck is his daily driver/tow rig. He has a large fuel transfer tank on the back for long trips. No problems with the motor so far....

 

i did not start running used oil till it was too late in my 04, they surmised my 04's lift pump died due to lack of lubrication additives.

 

It gets filtered many times in the engine and again by the fuel filter on it's way to the VE. I usually add a gallon ov WMO to a tank of gas without even straining it unless I know some dirt got in when I was draining it. Even Cummins says it's OK to burn WMO. It does make it smoke a bit more though.

Edwin