McDonald's grease - Dodge Cummins Diesel Forum
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post #1 of 37 (permalink) Old 07-18-2019, 01:09 PM Thread Starter
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McDonald's grease

I have a 94 Dodge. Stock everything.. but wondering if I can do an alternative fuel without too much modifications. Basically just wanting cheaper fuel.....anyone done this.? My cousin did this 50/50 mix in his 02 7.3 p.stroke. just wondering what would happen in this truck..

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post #2 of 37 (permalink) Old 07-18-2019, 01:13 PM Thread Starter
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I have a 94 Dodge. Stock everything.. but wondering if I can do an alternative fuel without too much modifications. Basically just wanting cheaper fuel.....anyone done this.? My cousin did this 50/50 mix in his 02 7.3 p.stroke. just wondering what would happen in this truck.. was looking into some kind of vegetable oil or a cheaper option

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post #3 of 37 (permalink) Old 07-18-2019, 01:58 PM
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There is a ton of information on the net about converting fry oil to fuel. I wouldn't even consider it, but if you have the time, storage and conversion materials available a good product won't hurt the engine. On the other hand if you pour it through a couple layers of cheesecloth, consider it filtered and pour it into the tank you won't have a well running engine for long.
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post #4 of 37 (permalink) Old 07-18-2019, 02:30 PM Thread Starter
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There is a ton of information on the net about converting fry oil to fuel. I wouldn't even consider it, but if you have the time, storage and conversion materials available a good product won't hurt the engine. On the other hand if you pour it through a couple layers of cheesecloth, consider it filtered and pour it into the tank you won't have a well running engine for long.
Yeah been doing some research this morning about it. Besides time being one of my main downfalls, is the vegetable oil warmers and other systems necessary? I was thinking about filtering using different microns and using different drums per micron filtering. One drum for just used oil, then another more 50 micron , then another for a 10 then another for 2micron. Also I would like to add more pre filters on the fuel lines to prevent any debris.

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post #5 of 37 (permalink) Old 07-18-2019, 03:07 PM
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I don't know. I don't have enough interest in it to make exploring the idea worth my time.

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post #6 of 37 (permalink) Old 07-18-2019, 03:15 PM
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I think if it's well-filtered and clean, it's not going to do any damage (though it might run terribly if you use too much!). There will probably be some trial-and-error process in determining how much of a mix you can do unless someone weighs in with some experience. I would suspect the optimum timing on the IP might, perhaps, change as well. I would also have some concerns about winter weather -- many of us remove the preheater on the fuel filter because it's pretty useless on diesel, but it may be critical if running vegetable oil in the winter in Tennessee?

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post #7 of 37 (permalink) Old 07-18-2019, 03:51 PM Thread Starter
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Yes it's in Tennessee. Fayetteville to be exact.
However I'm planning on either adding kerosene which is over priced or use Howes to stop the gelling and stuff

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post #8 of 37 (permalink) Old 07-18-2019, 06:28 PM
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Your best bet is to set up a 2 tank system with a looped return if you want to run it in the winter. I've run my red 97 and one of my 82 Mercedes for tens of thousands of miles without using a drop of dinosaur juice. I drove 3000 miles in the mercedes in one shot, TN-NY-PA-TN visiting family, using only one tank of diesel in december of 2015.

In the summer I'll blend up to 25 ish percent in any of my diesels, much higher and the viscosity of the fuel makes for hard starts and rough idles.

Also be aware that mcdonalds and other fast food places tend to overuse their oil leading to polymerization issues.


I'd never consider buying one of the "kits" to convert a mechanical diesel, especially if you plan on running it in the cold weather, proper heating helps the viscosity and will keep your engine healthy for a long time.

Doing it the cheap way, you'll be needing a new injection pump in 10-20k or sooner depending on how well you de-water and filter.
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post #9 of 37 (permalink) Old 07-18-2019, 06:40 PM
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Used engine oil, well filtered of course, seems easier.
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Maybe if we start telling people that the brain is an app, they will start using it?

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post #10 of 37 (permalink) Old 07-18-2019, 06:41 PM
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Take a look at the Alternative Fuels section here on the forum:

https://www.cumminsforum.com/forum/a...ls-lubricants/
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post #11 of 37 (permalink) Old 07-18-2019, 09:31 PM
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Used engine oil, well filtered of course, seems easier.
If it is filtered enough (in your opinion) to use as fuel why not put it into the crankcase where it belongs? Diesel is about $3 a gallon, engine oil is three times or more in price. I don't see a plus to putting WMO with all the contaminates you can't filter out and all the additives that won't burn into the fuel tank.

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post #12 of 37 (permalink) Old 07-18-2019, 11:43 PM
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With the additives largely depleted, putting it back in the crankcase is probably not a good idea.
Either way, used oil is free, and there are machines (such as the Oil Cat) made specifically for the purpose if filtering your own isn't appealing.

I did a lot of research and testing on using used oil in the fuel some years ago, and found that 15% was the sweet spot in the 6.2 I primarily used.
Up to 7% is endorsed by places such as generators in Alaska, considered perfectly safe, and I know from experience that 40% is way too much (hard starting, smoke, etc.).

Surprisingly, it's legal even in CA...as long as the oil comes out of the same vehicle it's being used in.
And there are other side benefits if one wants to run dyed fuel.

Maybe if we start telling people that the brain is an app, they will start using it?

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