2 cycle oil as a diesel additive WOW

Tactical .20

Tactical .20

New member
I found on the Cumminsforum that some people have tried 2 cycle oil in the diesel fuel. It makes the engine quieter and seems to improve the mileage 1-2mpg. There is no need for any other additive with the 2 cycle, it is reported to prevent gelling down to -30 in #2 fuel. They mix one qt to a tank full, one guy said it seemed to work just as good at 1 pt per tank. Try it you should be impressed.T.20
 
My '05 Duramax book said to only use an additive if it needed it for gelling problems. You can check out the Duramaxforum site to see if any one has used it and the results or benifits. I can't see why it would bother with that small of an amount per gallon.T.20
 
I have an '02 24 valve also t20. I've been using 2 stroke for the last 4 or 5 tanks. Seems to work well. It is hard for me to tell mpg improvement, as my driving is never the same, i.e. all the same route to work or whatever. I also just had a new lift pump and VP44 injector pump installed--under warranty. /ubbthreads/images/graemlins/grinning-smiley-003.gif My mileage does seem better though, but I think it will continue to improve as my VP44 breaks in. As to being quieter, I don't notice it much either, might have something to do with my straight pipe exhaust, /ubbthreads/images/graemlins/confused1.gif and I'm sure you know that the 24 valvers are the noisiest ones they made, which is why I like it. /ubbthreads/images/graemlins/grin.gif

Also, they say to use conventional 2 stroke oil, not synthetic.

kevlars
 
I had a Mercedes diesel for 12-13 years and frequently added a cup or so of ATF to the tank. Made the engine sound like a sewing machine. No ill effects were noted.
 
There has been much talk about putting additives in diesel fuel since the lubricity of the new low sulfur fuel came into question. If you have a new 07 with a catalytic converter, putting in the two stroke oil could screw it up. Yamaha 2W two srtoke oil I use in my PWC is designed for use with catalytic converters. I use the PS diesel additive in my Duramax to deal with the ULSD fuel lubricity issues.
 
The catalytic converter is not the problem with additives, it is the particulate filter that the new diesels have. It does however work REAL well in my 02 Cummins, which by the way has no catalytic converter, come to think of it it has no muffler either. /ubbthreads/images/graemlins/grinning-smiley-003.gif /ubbthreads/images/graemlins/grin.gif /ubbthreads/images/graemlins/cool.gif /ubbthreads/images/graemlins/confused1.gif

kevlars
 
Before you go and dump that bottle of 2 cycle oil in your tank think about this:

The cost to replace most light duty modern diesels found in light duty applications (pickups) runs about $7,000.

Has 2 cycle oil been tested to be compatible with diesel fuel? Can it be guaranteed that it over the long term wont have a chemical reaction that can harm the engine or fuel system? Keep in mind, 2 cycle oil is not designed to be run in high pressure diesel applications.

Before you decide to risk the health of a heavy repair bill plus towing from wherever you might be and inconvenience of breaking down in God only knows where and under what weather conditions consider the source of your information.

Are you really willing the risk breaking down in sub zero weather, in the middle of nowhere, with the family in your vehicle, based on some guy running around the web who says he dumped a product never approved or tested by any engine manufacturer into his fuel tank and got all kinds of mileage increases and (uncalibrated) dyno gains who has no chemical engineering experience other than being a "Mopar Man" or other such auto enthusiast?

Perhaps the reason the 2 cycle oil (or ATF) manufacturers never jumped up to market their product as a diesel fuel additive is they might be concerned about long term liability they would face should they encourage people to use their product for such a purpose.

Here's some more reading material on this.
 
ATF manufactures didn't jump up because a lot of them already have a diesel additive product and want to sell it. Telling the public that the ATF will work the same would negate the sell of the additive which is way more costly..

The old timey trick of adding ATF for the most part was to clean the injectors..

this trick goes way back before there were actually diesel fuel suppliments and additives.

ATF will not hurt the motor and can also be used in conventional gas motors as well to aid in cleaning the injectors, valves and loosening sticky injectors as well.

2 stroke mix will not harm a motor as it is a lubricant and is used on 2 strokes such as Stihl saws which are high compression motors to lubricate the bottom end of the motor. It does not burn well even under pressure..

2 stroke will not mix with all fuels however.. Ethanol is one that conventionaal 2 stroke will not mix with.

It will increase the compression ratio due to the fact that it has to be ingnited by fire rather than compression like diesel which in turn means that it doesn't burn until the diesel has ignited and already under way to compression.

2 stroke will also leave more residue because it is a lubricant and oil based.. Oil has been known to stop up catalytic converters..

That reason alone would be enough to deter me alone..

Any manufacturer that has to do warranty work and finds an additive that is not reccomended will automatically void your warranty.. I know a man that this happened to here in our small town over 2 stroke in the diesel. It was a Cummins motor.

Buyer beware...... James L.
 
What about Marvel Mystery Oil. Lot's of it has been used in diesels over the years. My Harley, Shovelhead loves the stuff, mileasge wise and it doesn't take much of it to make a differance either.
 
Do you mean the soy-diesel, Ranutah? We can get it w/5% soy at one station, but many of them don't have it. They are adding it now at what seems to be no extra cost, when they sold 2% soy-diesel they charged 2 pennies more per gal.
I tried 2% a couple years ago with my "01 Cummins, it blew a lot of black powder out. I haven't seen the same thing with the 5% in my '02 Cummins. I haven't figured out if the soy makes the engine quieter like the 2 cycle, yet. I'm not sure if it will improve the mileage or not, I'll need to clear the 2 cycle out and check it again. T.20
 
Bio-diesel can be made from many different oils, it can be made out of soy oil, sunflower, etc but most homebrewers make it out of used vegetable oil. The black smoke you are seeing is just unburned diesel. Most places here sell B20 which is 20% bio-diesel. I generally burn B100, 100% bio-diesel. Bio-diesel lubricates better than diesel and is the main reason why the engine quiets down and the good part is that you can make it yourself! /ubbthreads/images/graemlins/grinning-smiley-003.gif
 
Kevlar, that is where I am getting al my info, except what I found by using it. I am running 5% soy-diesel, real quiet engine, maybe better than 2 cycle, but the mileage may not improve, and will need an anti-gel for winter.
I thought about making bio-diesel, but I read you need to add chemicals to it or pre heat it before it goes into the injectors. I hear you need two tanks one to start the truck on diesel and then switch over to bio after it warms up, and then switch back to diesel before shutting it off. I know I'll screw that up sometime,lol.
I didn't get the black powder clouds before I tried 2% soy, I haven't seen it yet on the 5% soy. T.20
 


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