Run used oil - Page 2 - Diesel Forum

Maintain · 08-25-2006, 07:32 PM

I wouldn't do it. All those metal shavings and impurities scoring up your cylinder walls...

HenryE · 08-25-2006, 09:34 PM

cardiac

You are on the wrong board. There is info on burnign WMO on the alternative fuels board.

It is a different clan of folks there.

Check it out [img]/ubbthreads/images/graemlins/shrug.gif[/img]

01crewcabtg · 08-25-2006, 10:14 PM

Hey why try to change his mind.If he thinks he can pull it off, let him. Its his engine and his money. When he ruins his injectors(perhaps). I would bet we won't know about it [img]/ubbthreads/images/graemlins/biggrin.gif[/img]

klhansen · 08-25-2006, 10:26 PM

[ QUOTE ]
I'm not convinced I'm running such a risk. As for the reason, I live 40 miles from the nearest place that will take waste oil.

[/ QUOTE ]

If you change oil on a regular schedule (3000-5000 miles), they you'll be changing maybe once a quarter, which amounts to one 5 gal bucket of waste oil. And you're saying you can't get by that recycle place once a quarter? [img]/ubbthreads/images/graemlins/shrug.gif[/img]

When I weigh that "inconvenience" against the possible damage to a set of injectors, even the cost of running that 40 miles immediately after changing the oil makes sense to me.

GrampyJim · 08-25-2006, 10:42 PM

Look at it this way.... you can put whatever you want into your fuel tank. By the same token, many others have warned you that they don't believe that this is a good plan...

But, then, you return, still seeking justification... someone to tell you it's "OK".... Offering little "but if I"s.... Still no takers.

Being semi-impervious to criticism, it is left up to me to ask "what part of NO don't you understand..."?

Disclaimer... it ain't my truck... it ain't my motor and it ain't my wallet. Any of us will state an opinion - none of us can make your decision for you....... Some of us will not pass up the opportunity to say "I told you so....".

If you still decide to pursue this misadventure, I suggest pouring the same amount of used motor oil into your wifes car.... used oil isn't on the approved fuels list for it, either...

jas10 · 08-25-2006, 11:25 PM

Grampy,

Your presence on these forums is valued by many, including myself. But you can be extremely smug and condesending at times when it's completely uncalled for.

I'm not seeking justification and I don't care if it's ok with anyone else or not. I personally know a fair number of people that burn WMO in their diesel pickups. Do I blindly follow them? No! But anecdotally, they seem to do so without issue. I asked - repeatedly I grant you - why exactly is it not a good idea to do it. So far, the only thing I've heard is that WMO contains wear metals and contaminants that can cause excessive injector wear. If that is in fact the only compelling reason not to do it, I believe I'll filter it carefully and run with it. If there are other reasons - other than "because it's not recommended by Ford, Navistar, or Grampy" - then I'd like to know.

Btw... Nice attitude. It's good to know you're willing to have a civil discussion [img]/ubbthreads/images/graemlins/rolleyes.gif[/img]

-john

byantdt · 08-25-2006, 11:31 PM

It's a GREAT idea! But I do suggest a 50/50 mix as it will lead to quicker confirmation of what everyone has tried to tell you. Why trash a 10K engine for $3.00 per tank of fuel. What do you have to gain?

Sparkydm · 08-26-2006, 06:13 AM

"As for the reason, I live 40 miles from the nearest place that will take waste oil."
I'd be surprised if you could rebuild your engine for $2K. If
disposing of used oil is your concern, have you thought of
synthetic oil, high quality bypass filtration, and extended drain
intervals? That would drastically reduce your used oil disposal
and is safe when used in conjuction with oil analysis. [img]/ubbthreads/images/graemlins/shrug.gif[/img]

Oneof6 · 08-26-2006, 08:36 AM

[ QUOTE ]
Ok, but a micron is 39 millionths of an inch. And don't the fuel filters on our trucks filter to 20 microns? Seems that unless the fuel we put in is really really clean our injectors are on borrowed time anyway. If I run waste oil through a sub-micron filter and put in one gallon per tank I just can't see it causing problems. I could be wrong, but that's the way I see it.
-john

[/ QUOTE ]

Your math is a little off. There are 25400 microns per inch. Most fuel filters for diesel, at the engine, are 2 micron filters. Is it that the oil is hard to dispose of or is 3.75 gallons of old oil, worth about 12 bucks as fuel if that, financially important to burn as fuel every 5K miles?

DevoK12RS · 08-26-2006, 02:04 PM

[ QUOTE ]
[ QUOTE ]
Ok, but a micron is 39 millionths of an inch.

[/ QUOTE ]
Your math is a little off. There are 25400 microns per inch.

[/ QUOTE ] That's funny. You told him he was wrong and then told him he was right.

Anyway, how can [ QUOTE ]
The fitment between these tow parts (think fitment of piston to cylinder wall) is on the order of 20-30 millionths of an inch.

[/ QUOTE ]- which is about 1/2 to 3/4 of a micron- when the fuel filter is filtering to 2 microns? Engineered failure?

[img]/ubbthreads/images/graemlins/shrug.gif[/img]
Devo

Snowman269 · 08-26-2006, 06:43 PM

Ok, this answer is coming from a Tech from Freightliner who I trust completely.

You can't filter the impurities, dirt, metal etc down enough to where it won't harm these newer injectors & do it affordably. In the old days it was common practice. Also, you cannot remove the HIGH acid levels found in WMO by filtering, which also damage injectors. Also, the additive packages being used in todays diesel oils are designed to not burn under heavy load, high compression diesel engines. The additives are non combustable & flat out don't burn, in order to protect the internal parts of our engines. Since it doesn't burn easily & needs to be mixed with diesel to even pass it through the engine. Then it produces less power which requires more of it. So the savings are even less.

It's just a bad idea & not just for one, but for multiple reasons.

StorminNorman · 08-26-2006, 07:08 PM

[ QUOTE ]
Ok, this answer is coming from a Tech from Freightliner who I trust completely.

You can't filter the impurities, dirt, metal etc down enough to where it won't harm these newer injectors & do it affordably. In the old days it was common practice. Also, you cannot remove the HIGH acid levels found in WMO by filtering, which also damage injectors. Also, the additive packages being used in todays diesel oils are designed to not burn under heavy load, high compression diesel engines. The additives are non combustable & flat out don't burn, in order to protect the internal parts of our engines. Since it doesn't burn easily & needs to be mixed with diesel to even pass it through the engine. Then it produces less power which requires more of it. So the savings are even less.

It's just a bad idea & not just for one, but for multiple reasons.

[/ QUOTE ]

Very good answer. I am certain it will be ignored by many. [img]/ubbthreads/images/graemlins/shrug.gif[/img]

jas10 · 08-26-2006, 07:10 PM

Thanks Snowman. That's the kind of information I was looking for.
-john

gregrob · 08-26-2006, 08:11 PM

I had wondered the very same thing about the ACIDITY of the oil, but didn't know enough about motor oil to comment one way or the other regarding that.

h2odrx · 08-26-2006, 11:57 PM

[ QUOTE ]
Thanks Snowman. That's the kind of information I was looking for.
-john

[/ QUOTE ]
in my 87 if the CDR fails and oil gets in the intake it causes higher temps in #7 & #8 then may cause a head gasket failure? so if oil burns hotter why do it? [img]/ubbthreads/images/graemlins/confused.gif[/img]