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WillJacocks · 25-04-2011, 15:04

Generally, many who use veggie oil for their diesel will also add waste engine oil. They run it through filters and titrate it for the proper thickness so that it will be the right consistency. I have not hear of any problems with doing that.

barnakiel · 25-04-2011, 15:39

And why bother with some stupid fuel filters at all? They add cost, complication and fuss, while we all know they are not really necessary.

My father had a tractor once and ...

;-)
b.

doug86 · 25-04-2011, 15:49

for that matter, why bother changing the oil?

my uncle was a truck driver....

Bill Burgette · 25-04-2011, 16:00

Quote:

for that matter, why bother changing the oil?

Absolutely agree. In my younger days I had a car that burned a quart of oil every 600 miles. I added a quart every 600 miles. Every 3000 miles I had put in 5 quarts of new oil so there was never a need for an oil change.

Bash · 25-04-2011, 17:36

A buddy of mine was one of the original engineers at Hewlett Packard. He rigged an oil pump on his powerboat so that it would pump oil straight out of the engine into his fuel tank whenever he needed to change the oil. Didn't even bother to filter it.

One day, when I was walking up the dock with five gallons of spent oil that I'd just pumped out of my boat, he took the oil off my hands and poured it into his diesel Mercedes Benz. I was shocked, but he told me that he'd been doing this for years, and that the Mercedes had half a million miles on the odometer without the engine ever having broken down.

After that, I gave him all my used oil.

Chipg · 25-04-2011, 20:16

Farmers have done it for years on diesel pumps / generators but they also have very large fuel tanks 500+ gallons, if I were going to have my fuel polished that day before it ran through the engine I'd do it. This could be why there are farmers that have ford Lehman 120's with 30,000+ hours on them. Never seen one with that many in a boat.

sww914 · 25-04-2011, 20:46

I want that dirt to go away, not be continually concentrated in the engine that I depend on.
This is like saying it's OK to get stumbling drunk and then drive every single night because my bonehead neighbor has done it successfully for a number of years. It's a stupid idea in spite of an occasional success story.

psneeld · 25-04-2011, 20:52

Quote:

Originally Posted by sww914

I want that dirt to go away, not be continually concentrated in the engine that I depend on.
This is like saying it's OK to get stumbling drunk and then drive every single night because my bonehead neighbor has done it successfully for a number of years. It's a stupid idea in spite of an occasional success story.

Quote one instance where it has hurt...

again...most are not talking a 50/50 mix but adding less than 1% by volume...which may be the difference from buying fuel from one marina to the next in terms of clean fuel.

And who says the oil is full of dirt? Yes some combustion byproducts...so what's the harm? any quotable studies that actually show the harm???

I've never seen one. The motor oil may actually reduce the lubricity which could be bad...but again at the 1 or less percent occasionally...where's the beef to claim it's harmful?

sww914 · 25-04-2011, 21:41

I can't quote one instance where it has been harmful. I don't know for sure because I haven't done any studies. Have you? I said it sounds like a stupid idea. He asked for opinions and I gave mine, how did that ruffle your feathers?

Blue Stocking · 26-04-2011, 04:08

Aaahhh!!-for the good old days when fuel came with ZDDP, tetra-ethyl lead--and we added molybdenum di-sulphide (Molyslip)

Those of us who are involved with 60's sports cars ( Cobra for me) with big cube V-8s can tell you what problems we have with flat tappet cams wearing because of the eco-friendly oils.
i2f-where are you

**Pete7** · 26-04-2011, 04:23

Quote:

Originally Posted by psneeld

And who says the oil is full of dirt? Yes some combustion byproducts...so what's the harm? any quotable studies that actually show the harm???

Surely one of the ways to check the condition of an engine is to have the oil analysed regularly to see what the metal content is and if it's getting worse.

Our local injection pump specialist has gone to great lengths to provide a clean environment to work on diesel pumps so I wouldn't be too keen to undo his work by pouring old oil with metal into a tank and then run it through a diesel pump.

In an old worn out tractor it's probably quite a good environmentally way of getting rid of old oil, any extra wear is probably unnoticeable.

We don't have enough old engine oil each year to make it worth worrying about. Goes to the recycling dump into there large drum.

Pete

**boatman61** · 26-04-2011, 04:25

Quote:

Originally Posted by sww914

I want that dirt to go away, not be continually concentrated in the engine that I depend on.
This is like saying it's OK to get stumbling drunk and then drive every single night because my bonehead neighbor has done it successfully for a number of years. It's a stupid idea in spite of an occasional success story.

Could it be that... contrary to your belief that folks who do this are dumb... just maybe they're not... maybe they leave it to settle then pour of the top 90%... leaving the detrius in the bottom of the container...
Bit like red wines.... never empty the bottle into your glass... leave the last 1/2 inch with all the settled tannin in the bottle for the moron who wants the bad hangover in the morning...
Theres a right way and a wrong way... its not always the preactice at fault.. more often its the technique...

psneeld · 26-04-2011, 04:39

here's one studies results...

DIESEL FUEL LUBRICITY ADDITIVES
STUDY RESULTS
By
Arlen Spicer

August 2007

13) Used Motor Oil, Shell Rotella T 15W-40, 5,000 miles used.
Unconventional
(Not ULSD compliant, may damage systems)

HFRR 634, 2 micron improvement (statistically insignificant change)

200:1 ratio

16.64 oz/tank

price: $0.00

While it say it "may" damage systems...there was none noted in the study that was geared towards using the used motor oil as a "lubricity" improver....also note that it was added at a 200:1 ratio.

for those that care about their diesels, here were the top 3 additives...

1) 2% REG SoyPower bio-diesel

HFRR 221, 415 micron improvement.
50:1 ratio of baseline fuel to 100% biodiesel
66.56 oz. of 100% biodiesel per 26 gallons of diesel fuel
Price: market value

2) Opti-Lube XPD

Multi-purpose + anti-gel
Cetane Improver, Demulsifier
HFRR 317, 319 micron improvement.

256:1 ratio

13 oz/tank
$4.35/tank

3) FPPF RV, Bus, SUV Diesel/Gas Fuel Treatment

Gas and Diesel
Cetane improver, Emulsifier
HFRR 439, 197 micron improvement

640:1 ratio

5.2 oz/tank
$2.60/tank