If I wanted to dump some used motor oil in my fuel tank,,,,,,,,, - Page 3 - PeachParts Mercedes-Benz Forum

Stretch · #31 03-21-2013, 04:04 PM

Quote:

Originally Posted by greazzer

...
Hope the above helps. Sorry for the long winded explanation, ...

It most certainly does help - thanks for the detailed response it has made things a bit clear for me.

I'm not at the "whether you should do it or not" stage. I'm just interested to hear that you can in effect turn back the clock and clean the stuff to a certain extent.

ah-kay · #32 03-21-2013, 04:32 PM

Quote:

Originally Posted by Stretch

I'm not at the "whether you should do it or not" stage. I'm just interested to hear that you can in effect turn back the clock and clean the stuff to a certain extent.

I believe that is what the oil companies do when they recycle the oil. They blend the oil and add some chemical in there and resell them as fresh oil.

As for dumping them in the tank - I really cannot see an issue if it is blended with diesel. The engine cannot tell it is diesel or WMO blend, it only see it as oil and dispense them as such. No harm done as far as the engine is concerned. Oil is oil and any contaminant is burnt as well. Diesel also has contaminant and it is carcinogenic so it does not make a lot of difference in the grand scheme of things.

Is it a good practice? I would leave it to individual to determine the merit of doing it.

Skinflint · #33 03-21-2013, 04:57 PM

What Cheif said.

I run WVO, and occasionally I get a really bad batch of peanut oil that I burn off in a backyard fire pit. I put the stuff in a coffee can, stuff it with rags, and light it off.

Last month I accidentally poured in used motor oil rather than WVO once it had gotten going--the amount of black soot that the used motor oil produced was staggering. I have a screen over the fire pit--with WVO, there's minimal build up on the screen if any. With the MO, it was covered with black fuzzy soot after burning only half gallon of the stuff.

Any thought I had of burning MO in my engine--even diluted--went out the window.

Just my opinion.

Nathan

Volker · #34 03-21-2013, 06:43 PM

Quote:

Originally Posted by ROLLGUY

Agreed. Even if the used oil was ran through a centrifuge (the only way to properly remove particulate matter), there still is the environmental issue. Waste oil heaters are great for recycling this waste product, but not a road vehicle (IMO). And yes, properly filtered and dewatered WVO is the best waste product to run in a Diesel powered vehicle (IMO). Bottom line: WMO=NO!, WVO=YES!

Why? You're putting out the same heavy metal emissions... you get more soot in the diesel engine than a straight burner but that is just carbon and not usually relevant (after all you are driving diesel car...)

Why so much worry about particulate matter in oil that has been constantly filtered vs. diesel you got out of a underground tank?

whunter · #35 03-21-2013, 08:12 PM

Quote:

Originally Posted by davidlee

How did I know this would stir up the bee's nest, 1st off I dont dump used oil into the ground, I live in Portland and thats something that is punishable by death around here, 2nd I wasnt talking about running straight motor oil in my tank, just a little bit, and only every once in a while, I dont have barrels of used oil lying around that i dont know what to do with, Im talking about a gallon or two every few months, and 3rd (which I didnt mention before) its not used (diesel) oil, I run synthetic in my Diesel's now, since some guy on here that had thousands of posts told me basically I was stupid because i wanted to change out one of my lifters because it makes noise occasionally when its cold, I was told "waste of time", just spend twice as much every oil change and it will go away, 15K miles later on Delo400LE synthetic, it still makes noise sometimes. and 4th, Im not hell bent on running used oil though my fuel, I just wanted to know what potential damage it could cause.
Why would injection pump failure be caused by running a little oil through it?
Im not arguing, I just don't know, could someone please explain without talking to me like I'm some guy trying to ruin my car and my neighbors water supply.

You need to understand the extreme precision tolerance of diesel injection pump delivery valves.

Diesel Engine Technology: IN LINE INJECTION PUMP LUBRICATION
Because the sliding surfaces of these parts are lap-finished the clearance between them is very small. This is especially so in the case of the plungers — they are finished to the extremely close tolerance of about 1 /1000 mm (0.00004 in)
Diesel Engine Technology: IN LINE INJECTION PUMP LUBRICATION

Abrasive particulate is not friendly, especially adding the operating pressure/temperature inside the delivery valve.

*******************************

ScienceDirect.com - Wear - Effect of diesel soot contaminated oil on engine wear

HDDEO

Dump Rotella T6 and use Delvac?

.

wildhorsemfg · #36 03-21-2013, 08:16 PM

well of course grit is bad on the IP ... i dont think anyone is saying otherwise ..

they are just wondering savings on IE 20% WO for XX years ...
VS
the cost of another used IP ...

davidlee · #37 03-22-2013, 01:52 AM

Quote:

Originally Posted by ChiefRider

You deserve an appropriate answer.

Used diesel lubricating oil contains LOTS of particulate contaminant. Running even just a gallon thru your fuel system once in awhile will really shorten your fuel filter life. Your filter won't remove all the crap; some will make it into your IP, which is a fairly sensitive instrument. It is unlikely that this dilution of your lube oil will cause a failure, but it will contribute over time to increase the potential for a problem.

The bottom line is this:

The upside is you save a couple bucks for the "free" gallon of fuel.

The downside is you contribute to premature wear, and add an infinitessimaly small amount of pollution into the air.

Im not wanting to run used Diesel oil? I already said that, just some used gasser oil

davidlee · #38 03-22-2013, 02:07 AM

Quote:

Originally Posted by Left Coast

Your response to the controversy that you created seems a bit disingenuous to me. You didn't start this as an academic exercise. Your original post makes it pretty clear that you are looking for the easiest way to dispose of the occasional gallon of used oil. While I doubt that any real damage will be done if you filter and add that to a nearly full tank, and I wouldn't have a problem doing it with your vehicle, I think that would entail more effort than just disposing of it.

You already pay your hauler for the service, which includes carting off automotive fluids in reasonable quantities. Accumulating a supply of gallon milk jugs is cost-free, and requires little effort. I don't understand why anyone with that option would bother to do otherwise.

Well, Your 1st response didn't have anything to do with the question I originally asked as neither did your second response, I never asked for opinions on proper disposal, I asked what would it hurt under my hood if I dumped a little bit of used motor oil into my fuel tank every once in a while. You along with about 15 others gave tips and opinions on questions I never asked. And, I wasn't looking for the easiest way to dispose of it, I was wandering about the most fun way of disposing it, just so you know. Its not to save money or time, I just thought it would be fun.
But from what I have learned from the folks who took the time to answer my original question, I probably could get away with it for quite some time with the small amounts i am talking about running, but after reading what I have read from everyone, it seems to be about a 60 40 split favoring possible premature wear, and since Im not hell bent on doing it like I already said before before, I will most likely now not run it in my car.
I started out by asking a very simple question and 3 pages and 10 people later, that now think I hate my car and the Ozone. I learned something.
Thank You everyone. Just think if they found out I turned up my ALDA and smoke a little when I first come off a light.
Anyone who drives a older mercedes diesel (pre CDi) should not be scolding others about air quality.

ah-kay · #39 03-22-2013, 04:11 AM

Quote:

Originally Posted by davidlee

Anyone who drives a older mercedes diesel (pre CDi) should not be scolding others about air quality.

Some members here buy diesel from the dealership so to speak, and is very negative on alternative fuel, whether it is WVO, WMO or ATF. I really do not see any issues when blending a few quarts of WMO with 1/2 tank of diesel. However, the merit of such action is up to you.

Left Coast · #40 03-22-2013, 12:45 PM

Quote:

Originally Posted by davidlee

Well, Your 1st response didn't have anything to do with the question I originally asked as neither did your second response, I never asked for opinions on proper disposal, I asked what would it hurt under my hood if I dumped a little bit of used motor oil into my fuel tank every once in a while. You along with about 15 others gave tips and opinions on questions I never asked....

Had you not put the question in the context of your being hesitant to do either the right thing or the wrong thing with your old oil, I would agree. In fact, you made it clear that what you were really looking for was the easiest way to get rid the stuff without having to resort to something blatantly uncool. I made my suggestion, without judgement, because it appeared that you weren't aware of the alternative. It's up to you what you take away from all this, but don't blame anyone else if you didn't hear what you wanted to hear.

davidlee · #41 03-22-2013, 02:51 PM

Quote:

Originally Posted by Left Coast

Had you not put the question in the context of your being hesitant to do either the right thing or the wrong thing with your old oil, I would agree. In fact, you made it clear that what you were really looking for was the easiest way to get rid the stuff without having to resort to something blatantly uncool. I made my suggestion, without judgement, because it appeared that you weren't aware of the alternative. It's up to you what you take away from all this, but don't blame anyone else if you didn't hear what you wanted to hear.

Sorry for the confusion, I should have also mentioned the curb side pickup option, I wasn't intending to fire a bunch of people up with the question, even though on this forum I should have known it would be a hot one, I'm not saying you got fired up, I dont believe you did. I just wanted to know if it would hurt my engine, & I did get my question answered, wasn't what I wanted to hear, but never the less it was answered, It was answered by the people who explained how the IP is built and what it needs to be fed by to have a long and prosperous life, and what I would technically have to do to the oil to make it OK to run through the IP.

eatont9999 · #42 03-22-2013, 05:14 PM

I buy WMO by the 50 gallon drum. It has been used in Diesel machinery. I mix regular unleaded gasoline with WMO at roughly 80% WMO and 20% gasoline. Sometimes I do an 85/15 mix. I let the mix settle for a few days or a week before pumping it through a 10 and then a 1 micron sock filter. The filtered mix then goes straight into the fuel tank. No modifications are needed on the car.

I'm not worried about my IP. There are 5-6 just like it sitting in the PNP yards around here. I would worry more about the time it takes to replace an IP than I would the cost of another one. I can mitigate the inconvenience factor a little since I have another vehicle I can drive. The fuel savings is really nice, though. You can save thousands of dollars given some time.

If the IP is so sensitive, why is there only about 10 microns worth of filtering going on before fuel enters it? Diesel fuel is not always as clean as some people think.

ROLLGUY · #43 03-22-2013, 07:10 PM

Quote:

Originally Posted by eatont9999

I'm not worried about my IP. There are 5-6 just like it sitting in the PNP yards around here.

I would go get one or two for spares while they are still in the yard if I was you. I am not saying you will need to replace one soon by running WMO, but I am saying these cars will not be in the wrecking yards forever. There will come a time when they are all gone but the ones on the road (driven by you and I).

davidlee · #44 03-23-2013, 03:54 AM

Quote:

Originally Posted by eatont9999

I buy WMO by the 50 gallon drum. It has been used in Diesel machinery. I mix regular unleaded gasoline with WMO at roughly 80% WMO and 20% gasoline. Sometimes I do an 85/15 mix. I let the mix settle for a few days or a week before pumping it through a 10 and then a 1 micron sock filter. The filtered mix then goes straight into the fuel tank. No modifications are needed on the car.

I'm not worried about my IP. There are 5-6 just like it sitting in the PNP yards around here. I would worry more about the time it takes to replace an IP than I would the cost of another one. I can mitigate the inconvenience factor a little since I have another vehicle I can drive. The fuel savings is really nice, though. You can save thousands of dollars given some time.

If the IP is so sensitive, why is there only about 10 microns worth of filtering going on before fuel enters it? Diesel fuel is not always as clean as some people think.

How long have you been running that mix in you car?

eatont9999 · #45 03-23-2013, 10:57 AM

Quote:

Originally Posted by ROLLGUY

I would go get one or two for spares while they are still in the yard if I was you. I am not saying you will need to replace one soon by running WMO, but I am saying these cars will not be in the wrecking yards forever. There will come a time when they are all gone but the ones on the road (driven by you and I).

That is a wise observation and I have been researching the best way to pull an IP. I plan to have a few spares just in case. These IPs can fail unexpectedly even if just run on D2.