Putting used motor oil in your diesel fuel?!

bczoom · Nov 4, 2004

( Well, you convinced me. I'm definitely not going to put used asphalt in my diesel tank!! /forums/images/graemlins/grin.gif )

LOL

What a thread... I should have tuned in earlier. Oil in tractors, BTU's, brakes, road construction... have all been covered. /forums/images/graemlins/grin.gif

Junkman - I hate bleeding brakes... Is it an acceptable alternative to just about empty the reservoir and re-fill but do this more periodically to keep the amount of moisture down?

Everyone - All my waste fluids (motor oil, hyd. oil, brake fluid) all end up in the same bucket which is then given to a guy for his waste oil furnace. By volume it's probably 80% or more used motor oil but it ends up in a 500 gal. tank. Will the hyd. or brake fluid affect his furnace at all? Should I keep these 2 separate and dispose of differently?

JerryG · Nov 4, 2004

To all,
If putting used oil in a diesel was a problem I don't think that this would be taking place. Cummins Centinel

SkyPup · Nov 4, 2004

Brake fluid has about the same flashpoint as #2 diesel so no problem, but the hydraulic fluid will have alot more BTUs than diesel fuel does, he'll apprciate that for sure!

Junkman · Nov 4, 2004

( Junkman - I hate bleeding brakes... Is it an acceptable alternative to just about empty the reservoir and re-fill but do this more periodically to keep the amount of moisture down?
)

I don't see how this could hurt, but it is hard to know if the fluid in the lines ever migrates back to the master cylinder. My initial thought it no, but there is always the possibility. If you hate to bleed brakes, then have it done. It isn't that expensive. Also, unlike normal brake bleeding, you don't have the problem of air entrapment. Since all the lines and cylinders are already wet, it is just a fluid exchange. Just remember not to allow the master cylinder level to get to low in the process.

bczoom · Nov 4, 2004

[quoteAlso, unlike normal brake bleeding, you don't have the problem of air entrapment. Since all the lines and cylinders are already wet, it is just a fluid exchange.)

Thanks. Since it's just an exchange, I guess I should just do it.

cp1969 · Nov 4, 2004

I'd read about a different system which does the same thing as the Cummins Centinal. Much cruder, but the principle was the same. The key to mixing used oil with fuel is the dilution percentage. Cummins recommends no more than 5% used oil be mixed with the fuel. They cover this topic pretty thoroughly in their publication "Fuels for Cummins Engines" No. 3379001-05.