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Old 04-04-2011, 02:58 PM   #1 (permalink)
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Adding 2 cycle oil to the fuel

I have been here alot about adding 2 cycle oil to the fuel at fill ups does anyone have any input on this..it is a good thing of should i stay away from this.. iam a new diesel owner have a 07 with a 5.9 its all stock ..thanks for any info
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Old 04-04-2011, 03:18 PM   #2 (permalink)
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Not only not needed, but could cause problems with injectors etc. Don't add junk to your fuel. Your Cummins likes clean fuel.
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Old 04-04-2011, 04:10 PM   #3 (permalink)
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I did it for a few months when I first got my dodge. Didn't notice any diff in power or mpg gain so stopped.
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Old 04-04-2011, 06:07 PM   #4 (permalink)
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I have been doing it the last 30000 miles o problems and i gained a solid 1 mpg . Its not gonna screw up your truck all trucks respond different to different things my advice is try it a couple fill ups and see how it works for you . I put .5 oz of walmart brand twc-3 marine two stroke oil ,a gallon is $11.00 I keep a full 16oz in door pocket .
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Old 04-04-2011, 06:11 PM   #5 (permalink)
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i had an injector sticking and would give me rough idels on start up, started using the ashless 2-stoke over a year ago and it went away right after
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Old 04-04-2011, 06:14 PM   #6 (permalink)
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how much oil do people add per gallon?
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Old 04-04-2011, 06:17 PM   #7 (permalink)
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1oz per Gallon
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Old 04-04-2011, 06:23 PM   #8 (permalink)
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16 ounces per 25 gallons is about the most I use on my 06. Experiment ,but that seems work best on mine. I have always kept detailed mileage and do see about a one half mile per gallon gain. Also a little quieter. Varies from truck to truck but works for me
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Old 04-04-2011, 06:26 PM   #9 (permalink)
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I agree with rprice704 about trying it out. Assuming you use the correct oil in the correct amount, you're not likely to screw something up. In all of the research I did before trying it out, I didn't find anyone that had any significant adverse effects from using 2-stroke oil.

My experience is that it has done nothing for my truck. I have been using it in conjunction with PS Diesel Kleen for about 2 months, but have experienced a slight drop in mpg so I plan on stopping for awhile. When the weather is warmer, I'll try it out again for a couple months.

There are benefits to using it even though it may cost you an mpg and thats to lubricate the lift pump and make your injectors a little happier. Some 3rd Gens like it, some love it, some don't really seem to care, and a few don't exactly run well with it.
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Old 04-04-2011, 06:45 PM   #10 (permalink)
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I did it on a trip I took about 800 mile round trip I don't knoe if it was just dumb luck of dirty fuel or if the oil didnt break down good enough but I was only adding 4 onces per tank and my filter gummed up and truck would hardly run after the second tank so haven't tried it since
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Old 04-04-2011, 07:18 PM   #11 (permalink)
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It just makes since to me ulsd does not have lubricants like the old diesel that our trucks were designed for.
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Old 04-04-2011, 08:52 PM   #12 (permalink)
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Cant say for sure, but seems like the Walmart oil does help mine. Didn't start adding anything until this last fall at about 100k after I had some injector issues. I have tried PS Diesel Kleen, Howes, Walmart 2 Stroke, and Optilube. Have not had injector or filter issues when running a lube about 12k miles. May be a little smoother and quiet idling. Optilube among other lubes were involved in a test you can search for. I know I have added a link a couple times on this forum. Bottom line, I will run some kind of lube on a regular basis from now on.
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