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How to tell if diesel has been mixed with oil?

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How to tell if diesel has been mixed with oil?

Old 11-29-2023, 08:17 PM
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Auburn02
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Default How to tell if diesel has been mixed with oil?

I have a system in which I always add a quart of Kingtech oil to an empty 5 gallon jug prior to filling the jug from the diesel pump. With that said, a little while back I bought a new jug and immediately filled it with diesel after leaving the store and do not recall if I added oil at that time.

Iím not using the newer KT oil with red dye, that will be nice (unless I end up switching to kero), so looking for any tips to verify that I did add oil already.

Also before it gets mentioned, I already started pouring fuel out of this jug into another which is when I started to question it, so I missed the opportunity to measure it out and see if the jug actually had 21 quarts of liquid instead of 20. Doh.

Any ideas? Worst case Iíll just dump it all and start over but rather not have to do that.
Old 11-30-2023, 05:39 AM
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A. J. Clark
 
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Don't have answer on how to know it there's oil mixed in fuel. I would be to cheap to throw it out. I would add oil to it then mix it with your known good mix a small amount as you fly. Like a gallon to 5 gal of good mix. Maybe have a little extra oil but not enough to hurt anything.
Old 11-30-2023, 07:56 AM
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CARS II
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It’s been asked here before and…… most of us have done it and will again.

The simplest solution to this is to just add another quart of oil to the can ( most of us mix 5 gallons at a time ) and go fly, downside? A little bit more visible smoke, that’s all.

Last edited by CARS II; 11-30-2023 at 09:39 AM.
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Old 11-30-2023, 09:35 AM
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Originally Posted by CARS II
Itís been asked here before andÖÖ most of us have done it and will it again.

The simplest solution to this is to just add another quart of oil to the can ( most of us mix 5 gallons at a time ) and go fly, downside? A little bit more visible smoke, thatís all.
I thought for sure I had read a similar thread but as per usual RCU let me down again and my search turned up nothing.

So long as the only downside is some extra smoke, shouldn't be much of an issue. Good enough.
Old 11-30-2023, 09:42 AM
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Me using Kero with two quarts of turbine oil will almost be like using Diesel with a quart of turbine oil 🤷‍♂️
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Old 11-30-2023, 10:18 AM
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know anybody with a disel truck, oickup, or car?

just dump it in their tank and start over.

ps: i drive a diesel pickup...
Old 11-30-2023, 11:03 AM
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I have dumped old mixed diesel in mine as well, couldn't tell a difference.
Old 12-09-2023, 07:19 AM
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Come up with a system that will prevent this from happening. What I do is, I have only 2 cans that will be mixed with a label stating mixed only and the other storage cans will be un mixed being unlabeled. So these I can also use in my kerosene heaters in the winter. I use only Jet A.
Old 12-09-2023, 10:58 AM
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Easy for me. I use Amsoil Dominatir synthetic. It's red.
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Old 12-14-2023, 05:41 PM
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You can get dyes made for kero lamps, I use blue, You can dye the jug of oil so that all mixes will automatically be dyed. I have the dye in my Biobor so that when I add that the fuel will be dyed. It only takes a couple of drops of the dye.
Old 12-15-2023, 04:13 AM
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Vincent
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Add an extra quart of oil and go fly. It will be fine...been there done that,
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Old 12-15-2023, 07:59 PM
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if ya gotta ask, then the answer is probably, no, there is no oil in it. at least, that is the safe answer
Old 12-17-2023, 01:50 PM
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Answer is simple. Get a sample and put it in a small pan. Heat it to evaporate the diesel. If there was oil in the sample, the oil should remain.
Old 12-17-2023, 05:52 PM
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let us know how the wife reacts to ya trying that with her cookware...
Old 12-18-2023, 04:39 AM
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Originally Posted by mongo
let us know how the wife reacts to ya trying that with her cookware...
If I did that you'd know it by my obituary being published
Old 12-18-2023, 12:18 PM
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Use the experiment as an excuse to cook some steaks on a charcoal grille. After the cooking is done, put the sample in a tin soup can and set it on the grill to evaporate the diesel. If the sample should happen to ignite, it will be confined to the tin can in a safe place.
Old 12-18-2023, 12:48 PM
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Number 2 diesel fuel has a flash point of about 126 degrees F. That is the temperature at which the diesel fuel will evaporate fast enough to produce vapors ignitable by a spark or a flame. Diesel fuel has an auto ignition temperature of about 410 degrees F, at which point the vapors will ignite without a spark or a flame. The ideal way to cook off a sample is to place the sample in a tin can and simmer it on a hot plate for which the temperature can be controlled to about 200 degrees F. Make sure there is a slight breeze to keep the vapors away from any spark or flame producing equipment components.
Old 12-19-2023, 08:07 AM
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Originally Posted by stealdesk
Come up with a system that will prevent this from happening.
Literally the first sentence of the post. Only caveat here was a new diesel can was purchased and filled on the way to the airport when I didn't have the oil with me.

That said, I have a very high level of confidence there is oil in the diesel because that new can was purchased/filled in Kentucky in July, but I refilled all of my cans for Georgia in September. It had just been a couple of months since that event and I started to question it. I'm going to add additional oil just to be certain, as suggested by a few here. Though I do like the ideas to experiment with evaporating the diesel - I knew that practice could be used for gasoline but wasn't quite sure about diesel, worth doing just for grins.

Thanks again.
Old 12-19-2023, 12:50 PM
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you could also try an amateur chromatography.

cut a coffee filter into 1/2" wide strips about 3-4 inch long.

stand em up in 3 cups

add about 1cc of fresh raw un oiled diesel to one, and 1 cc of the suspect fuel to the another, and 1 cc of properly mixed fuel/oil to the 3rd..

let it sit overnight and compare the ring patterns of the the strips.

should be able to see a difference in the one that has oil as compared to the one that does not.

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