50% used motor oil 50% diesel - Page 3 - PeachParts Mercedes-Benz Forum

phasmatisnox · #31 07-20-2006, 10:12 PM

Quote:

Originally Posted by brabus

Didnt think about the metal situation, I just figured all of the oil was fairly well filtered already, because of the oil filter and then fuel filter.

You can get really cheap ($5) sock pour-through filters from McMaster that will filter these out as fine as one micron. I'd reccomend 2 microns for anything you're putting in your tank.

85chedeng300D · #32 07-20-2006, 11:05 PM

Quote:

Originally Posted by P.E.Haiges

Think about it: Why wouldn't all the metal particles and soot grind up the engine when it goes thru millions of revolutons when the oil is in the engine crankcase and pumped thru the engine and sprayed into the cylinders? How will used engine going one going thru the engine one more time hurt the engine?

Possible it could damage the IP or injectors, but I've been using a small percentage of used engine(~2%) with no bad results. With the ULSD Diesel fuel, the used engine helps to lubricate the IP.

But 50 % is way to high a percentage. It will carbon up the engine inside. I had an old 190D engine that had a crack in the head that leaked engine oil into #1 cylinder so it used about 1 quart of oil every 150 miles. When I took the head off, the inside of the cylinderhead was thick with burned carbon and I imagine the pre-chamber was too.

150 miles per quart is about a 20% concentration of engine oil going to the 1 cylinder that leaked. That's too much in my opinion. I can't believe that there was no blue smoke with a 50% concentration because my old 190D smoked a lot because of the oil leak.

P E H

Good point! But, why do you change the your engine oil and filter with new and unused ones????

P.E.Haiges · #33 07-21-2006, 02:16 AM

85,

Because the detergents in the oil are consumed and some of the oil polymerizes from the heat and in DIesel engines, the soot level increases beyond specifications.

Then is time for new oil in the crankcase and the old oil can be used to power the Diesel engine. Its only going thru the engine one more time after going thru the engine thousands of lubrication cycles. And remember I filter it before I burn it.

P E H

#34 07-21-2006, 09:00 AM

You know what's scary, some new person is going to read this thread and actually run this junk through their engine. Having this oil in the crankcase is not the same as running it through the IP. Talk is cheap, but they should be aware that a rebuilt IP costs $800+ and takes about 5 hours to install. Using used oil may save you $5 in fuel and a trip to drop off the used oil. Anyone actually considering this should do the math for themselves. Even if the risk is small, it's not worth it.

Also, and I know some folks here don't care, this is hazardous waste that should be disposed of properly. Used motor oil contains significant contaminates (just read an used oil analysis), and burning it releases all these to the environment. Why do people think it's OK to release this into air, but they would never consider dumping it out on the ground? Even if you can't see it, it's still there. Diesel engines already have a reputation as being "dirty" due to the visible soot, this type of nonsense doesn't help.

Panzermann · #35 07-21-2006, 02:11 PM

Quote:

Originally Posted by IndianaJo

I burn 1 quart of used motor oil per tank, no problems yet. I do let it sit for a month or more to let the water and sludge settle to the bottom, I donate that to the service station. I also run a 20 micron Goldenrod 495 fuel filter instead of the tiny, forever stopping up, primary Mercedes/Bosch fuel filter. Sunflower filters are available from the farm supply, for pumping fuel out of private tanks. They have a water separator bowl, and a real water drain like a Model A used to have. If you install one, use metal lines with not too much rubber hose. I hung the 495 filter from the passenger shock mount bolts.

I still don't understand. WHY??? Is used motor oil the best thing since Lubro-Moly? Are we doing this because we can? If motor oil is that good for the engines function, why don't you add a quart of fresh motor oil to the tank every fillup? A quart of motor oil can be had for $1-2 and does not require filtering (because there are no metal particles in it!). I've asked a few bizarro questions on this forum as intellectual stimulation, but setting up a whole filtration system so you can burn used motor oil seems ridiculous

(unless, as I note in my previous post above, you are planning on running out of diesel fuel in the middle of the desert in Niger and plan to use the motor oil from your crankcase to run your engine to save your life....in which case, you probably shouldn't be going into the desert anyway!)

CarolinaMBZ · #36 07-31-2006, 04:52 PM

Because for high miler frequent changers, a lot of time and space is wasted recycling oil. I change every 2500 miles and last time I went to the recycler, I took about 50 gallons (approx. 2 years worth, its amazing how many jugs you can collect in your shed before you run out of space). The way I look at it, I recycled $175.00 that I could have used in my car and could have avoided the PITA of loading it all up and taking it to the recycle center. I haven't done it yet, but view this as Biodiesel for the time constrained. I will, of course, filter it first and will let you guys know how it comes out. Most of the oil will be out of sparker engines however.

Panzermann · #37 07-31-2006, 08:17 PM

Quote:

Originally Posted by CarolinaMBZ

Because for high miler frequent changers, a lot of time and space is wasted recycling oil. I change every 2500 miles and last time I went to the recycler, I took about 50 gallons (approx. 2 years worth, its amazing how many jugs you can collect in your shed before you run out of space). The way I look at it, I recycled $175.00 that I could have used in my car and could have avoided the PITA of loading it all up and taking it to the recycle center. I haven't done it yet, but view this as Biodiesel for the time constrained. I will, of course, filter it first and will let you guys know how it comes out. Most of the oil will be out of sparker engines however.

Still, if you like your cars and there is some possibility that used motor oil could damage them, WHY would you risk it, for such a minimal benefit? $175 over 2 years compared to the cost of an engine?

The fuel that you've used over that period of time (2 gallons per oil change, 25 changes total, 2500 miles between changes, 62500 miles, 20 mpg, 3125 gallons, $3 per gallon, $9375 for fuel, $175 being about 2% of your total fuel expenditures) vastly exceeds the trivial amount of movement you'd be able to get with that 50 gallon barrel of used motor oil. Clearly, based on that calculation, you are not hard up for money for fuel!

Implementation of a filtration system itself probably would cost more than the value of the oil that you could burn!

Risking my car for such trivial benefit? No thanks! (Unless I'm caught in the desert in Niger dying of thirst, as I've noted in my previous posts....)

Hatterasguy · #38 07-31-2006, 10:48 PM

Lets say I change the oil in my SDL twice a year. Thats 4 gallons of used oil. If I dumped said used oil in the tank I'd save a massive $12 per year.

Thats about what I will spend on lunch tomarrow. Or a bucket of balls at the driving range.

No thanks not interested.

#39 07-31-2006, 10:56 PM

Aside from the obvious stupidity of burning this stuff, this is the part I don't get. If it's to much trouble to bring it to be recycled, why are you folks willing to spend the effort required to filter it? There is no economic benefit, it requires more work, and you are likely to end up with a parts car within a few years. Again, what's the point?

P.E.Haiges · #40 07-31-2006, 11:05 PM

Hatteras and Craig,

Just my little way of sticking it to the AAAAAAAAAAAArabs and Big Oil.

P E H

Hatterasguy · #41 07-31-2006, 11:06 PM

I'm lucky my dad brings the old oil to be recycled, but I can see how it would be a pita. If I had to do it myself I'd just have someone else do the oil change.

A garage down the street would probably do my SD for like $30.

Panzermann · #42 07-31-2006, 11:07 PM

Quote:

Originally Posted by Craig

Aside from the obvious stupidity of burning this stuff, this is the part I don't get. If it's to much trouble to bring it to be recycled, why are you folks willing to spend the effort required to filter it? There is no economic benefit, it requires more work, and you are likely to end up with a parts car within a few years. Again, what's the point?

You are caught in the desert of Niger, you have run out of fuel, you will die if you do not get your car to run. That is the ONLY point. Otherwise, there is no point, other than to pollute the air more than need be and possibly damage perfectly good Mercedes-Benzes!

#43 07-31-2006, 11:12 PM

Quote:

Originally Posted by P.E.Haiges

Hatteras and Craig,

Just my little way of sticking it to the AAAAAAAAAAAArabs and Big Oil.

P E H

The only person you will "stick it to" is yourself. FWIW, I just bought a reman. IP for my 617 for about $900 (from Phil), the list price is $1600. My original lasted 340K miles, I would prefer not to buy another one anytime soon.

P.E.Haiges · #44 08-01-2006, 10:29 AM

Craig,

Why did U have to replace your IP? What went wrong with it? Did U burn used engine oil in your MB?

P E H

Gauge · #45 08-01-2006, 10:37 AM

Actually, if you burned the engine oil you might still be using that injection pump.

I have a Chilton's manual for my 220D which recommends adding 1 quart of engine oil per tank in the summer to lubricate the injector pump.

If you can filter out the nasty stuff, it kind of makes sense to me. If it lubricates my engine, it will lubricate my pump too.

Just my .02.