What is the feedback on burning used synthetic oil in with the diesel.
can I dump my 3 gallons in the tank after doing an oil change ?

 

Guess I would not. Not sure what the additives in the synthetiocs might do. The CP3 and injectors are a little too pricy to take a chance to me. Someone else may chime in with better information but that would be my first impressions.

 

Think about all the stuff in the waste oil. Now think about how small the orifice is in your injectors, also the precision tolerances in the injection pump. Why would you do such a thing? Who told you to do that? Also dumping 3 gallons in the tank is not a good idea.
But it's your truck...

 

Burning waste motor oil (WMO) is not that big of a deal. It may be in the HPCR, but the old 12v's have been doing it for years. In the Cummins website there is a link about the sentinel system that automatically pumps small amounts of WMO back to the fuel tank to be burned. I don't remember which engines this is for, but I think it was for the heavy dutys not the ISB's. Anyway, the theory is good. The only thing that may make it problematic with our engines is the fussyness of our injectors with regard to the particles that exist in the WMO. There are folks I know of that put a couple of quarts of their WMO into every tank full until it is gone. They have HPCR's and have reported no problems. My last follow ups with them... adding the total of 3 trucks... indicate about 35,000 collective miles doing this. That does not mean I am recommending it here-- just trying to throw out some info. I do not know about syn vs dino.

 

Why contaminate your fuel system with 3 gallons of soot filled, chemical and solid saturated waste oil? What's the up side of that? Besides saving yourself 3 gallons of fuel and putting some terrible toxic waste into the already filthy air we breathe, your sending all that your oil system prevents your engine from being exposed to directly through the most sensitive parts of the motor. Hard to justify IMHO.
Mike
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I am going to start blending WMO in with my heavy eqip. diesel. A will filter wmo with a 3 micron water sep filter. I will then blend 1/2 diesel 1/2 oil in 55 gallon drum. I will tap electric pump at the base with 1/2 Line with ball valve. I will then adj. pump to pull a 15-20 to 1 blend into my equipment tank. I will not run in common rail yet but maybe someday.

 

I have read a bit on the subject, and while many have added WMO to their fuel in various concentrations, and suffered no damage, it is NOT recommended to do so with synthetic oil. Reports indicate a lot of visible smoke with synthetic oil, so it can be assumed that the synthetic oil doesn't burn nearly as well or as completely as dino oil.

 

Why the heck would you burn it when almost ALL auto parts stores will recycle it for you for free. All you have to do is drop it off to them.
Scott

 

Dump it in your fuel tank at home and heat the house, that's what I do. Don't risk your injectors and pump for $10 bucks worth of fuel.
I used to run it in my 99' but I won't risk it in the CR.

 

The big-rigs have a complex centrifugal filtration system, where the wmo is recycled in a minimal mixture - the soot and stuff is mostly removed - easy to burn off over the tens of thousands of miles they run each week

Your CP3 common-rail truck doesn't readily have those options - the unfiltered\untreated soot\ash filled crankcase oil is very abrasive in the clearances spec'ed in thousandths of millimeter in the pump and injectors - it's like running abrasive slurry - that's behind the requirement to change it at x#thousand miles in an engine where clearances are spec'ed in thousandths - not something I would willingly choose for a 23300psi injection system