Adding oil to fuel for lubricity
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    Dodgendeere87's Avatar
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    Adding oil to fuel for lubricity

    So I know it’s not uncommon to hear people adding a half a quart or so to 5 gallons of diesel to lube everything up. I’ve never heard anything bad about it but I wanted to see if it would be okay to dump a oil in the fuel???? I always end up with little 1/4 full quarts of oil around and it would be nice to use them for a good purpose. Any thoughts???

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    Keeper of the GTT Cookies dieselshadow's Avatar
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    I would never ever do this. There are a lot of additives that are in that oil that isn't designed to be burned. ATF is even worse, it has friction modifiers in it. These additives can gum up your injectors and deposit ash where you don't want it. Modern diesel fuel systems are extremely finicky and have very very tight tolerances. Don't put stuff in there that compromises that. And don't even think about it in any diesel that has exhaust aftertreatment.

    Stick to regular fuel additives, quality ones, not just what's on sale at your local corner store.
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    Quote Originally Posted by Dodgendeere87 View Post
    So I know itís not uncommon to hear people adding a half a quart or so to 5 gallons of diesel to lube everything up. Iíve never heard anything bad about it but I wanted to see if it would be okay to dump a oil in the fuel???? I always end up with little 1/4 full quarts of oil around and it would be nice to use them for a good purpose. Any thoughts???
    No... there are appropriate additives to add. Yes it will run, but I would not do that. I Buying some biodiesel, will do just as well. And if your machine has a DPF, you definately do not want to do it. Your profile does not mention what you have.

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    those left over 1/4 bottles are for your oil squart can for lubing chains cables and more
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    Quote Originally Posted by Dodgendeere87 View Post
    So I know itís not uncommon to hear people adding a half a quart or so to 5 gallons of diesel to lube everything up. Iíve never heard anything bad about it but I wanted to see if it would be okay to dump a oil in the fuel???? I always end up with little 1/4 full quarts of oil around and it would be nice to use them for a good purpose. Any thoughts???
    I haven't heard that for some 50 years I think. Today's diesels are not the same as Grandpa's smoker.
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    AGREED with others!!!!! Absolutley not!!! Never never never never never put engine oil in diesel fuel.
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    On an old engine that is designed for high sulfur diesel, it would probably be alright because the ULSD we use has reduced lube properties. Many have had success with 2 stroke oil in their old engines. On a newer engine (especially common-rail engines) this is a VERY BAD IDEA because these systems are designed for ULSD, and are self-lubricating accordingly. They have very tight tolerances, so anything added may have an impact (think watery diesel in a bosch CP4=instant empty bank account)

    That said, there are plenty of additives that are designed specifically for these new engines and ULSD. I would use one of those if you're worried about something.
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    Adding oil to fuel for lubricity

    2 stroke oil isnít designed to go through any diesel engine. Just because you didnít have any issues with it in the past, doesnít mean it was a good idea.

    Just think, if it was a good idea, donít you think the OEMs would be recommending it? What about the oil manufacturers? They too would definitely jump onboard to sell you more product.

    Stick with additives designed for diesel fuel if you choose to use them.
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    I agree with the others.
    Besides the fact that half a quart added to only 5 gallons is way too much oil, I have heard of this practice, but its very old.
    The only oil guys routinely add to their diesel is 2 stroke oil. Thats not necessarily a good thing either.
    Ive never done it much in my diesels, except the TDI, but even then, its less than an ounce a gallon. Does it help?
    Well, my mileage is marginally better with it vs not, but it also adds more contaminants to the oil, so it wont last quite as long when done on a regular basis, so its not really a good trade off.
    Additives, good quality additives, will add all the lubricity your pump needs. No need to add additional oils that may just plug up filters.

    Add to that the newer DPF and associated parts, and Id stay way away from adding anything other than a well recognized diesel additive!
    Last edited by IndianaJim; 12-13-2018 at 06:41 PM.
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    IndianaJim's Avatar
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    Quote Originally Posted by dieselshadow View Post
    2 stroke oil isnít designed to go through any diesel engine. Just because you didnít have any issues with it in the past, doesnít mean it was a good idea.

    Just think, of it was a good idea, donít you think the OEMs would be recommending it? What about the oil manufacturers? They too would definitely jump onboard to sell you more product.

    Stick with additives designed for diesel fuel if you choose to use them.
    While I agree that they arent designed for it, it does work. Several diesel truck sites discuss it all the time, and much like oil type/grade threads, they tend to get heated one way or the other.
    Ive done it in my little TDI, and it does help somewhat, but besides the additional cost, it also will degrade the oil faster as a side effect.
    Thats something I recently read about, and why I dont do it anymore.
    But running regular oil in a diesel? Thats not something Ive heard of anyone doing in a very long time, except those that run waste oil, and thats not quite the same thing...because I dont know anyone cooking with motor oil.
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