Question for T_Bone

[tg in VA]

Did you say that when they changed the oil at the sod farm where your son worked, they just dumped the burned motor oil back in the fuel tank? Was this done and then the tank filled with diesel? In other words, was there a ratio of burned motor oil to diesel? Sounds like an interesting idea but I don't want to ruin an engine to save $20.

 

[T_Bone]

Hi tg,

Yes they dumped in "used" motor oil, not burned oil, diff oil or any other waste oil that was created during the repair/maintance, then the machine was refilled with No2 before returning to service.

About the only time one would have to watch using this method would be in cold climates where the visocity might be too thick for the temperatures. That all depends on how large of fuel tank the equipment has. If you were mixing 4gal of used oil to a 40gal fuel tank, then I really don't see a problem until straight No2 would start having gell concerns because of ambient temps.

T_Bone

 

[Anonymous-0]

That's strange. Wonder if it burns like fuel or just a smoky disposal.

 

[mike diesel]

That all fine and good, but being a diesel mech. for 12 years, I wouldn't do this with any newer electronic engines.

 

[T_Bone]

There is no difference in the exhaust smoke if not mixed heavy. At approx 10% mix, there would be very little effect as motor oil would be approx a No4 fuel oil when comparring viscosity and engines designed for No4 thru No6 fuel oil don't smoke excessive under normal use.

Whether it's a DI or IDI engine design would have little effect under a light oil mix. Computerized controls would have no bearing on the mixed oil.

A interesting note: Cummins uses the same method in the OTR engines today and have been for a few years as that's how they get 100k miles between oil changes. They take sump oil and "direct" inject it into the engine then use a small make-up oil tank to replace what was exchanged.

T_Bone