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Old 11-21-2007, 09:30 AM
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Adding motor oil to fuel

With all this talk about "lubricity" of the ULSD fuel... I was wondering. Couldn't we add a bit of dino, CJ-4/SM 15-40 to the tank? or maybe some 5w-30? like a 1/4 of a quart to a tank maybe? B/c I have heard of old truck drivers dumping in used oil to their fuel tanks.
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Old 11-21-2007, 09:33 AM
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yes you could but i prefer a quart of straight vegi oil in every tank...it burns cleaner.
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Old 11-21-2007, 09:36 AM
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I just added some 2-stroke ashless marine oil. Urban legend says it adds mpg's to the winter blend.
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Old 11-21-2007, 10:38 AM
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THIS ARTICLE IS A GOOD READ:
There is *no* advantage to adding motor oil, or transmission fluid to diesel fuel. Period.

There are disadvantages to doing this however, including damaged injector pumps (especially with turbo diesel electronic pumps), clogged filters, etc.

The manufacturer of our injector pumps strongly cautions against using either when their pumps are used.

There are many additives that are approved, and are in fact *much* cheaper than either motor oil, or transmission fluid. As an added bonus, these additives really work!

Most diesel fuels and engines don't need additives, but if you feel the urge to pour something else in the tank besides diesel fule, use a product that is *specifically designed for the purpose*.

Kerosene is added to diesel fuel by some suppliers, though in small quantitites. Kerosene has virtually no lubrication qualities--adding more (and an essientially unknown amount, since you don't know if or how much has already been added by the supplier!) is a sure way to cut the life of your injector pump. Kerosene is routinely added to home heating oil, in large quantities. The furnace doesn't know, or care. The furnace oil pump does not have the same clearances (they are more crude, greater clearances, lower pressure...) and the kerosene won't hurt them. Most will (and often do) run on straight kerosene--here in NH, if the oil tank is outside, the mix will be either 50/50 or straight kerosene. Kerosene doesn't have the same heat values either, you won't get the same amount of power from a gallon of kerosene as from heating oil, or diesel fuel.

#2 diesel fuel is basically #2 heating oil, with the exception that rather than adding kerosene the supplier will add an anti-gel additive. Costs more, but then it sells for more. In the summer, there is virtually no difference, other than legal issues. (again well debated).

Bottom line:

A wise owner will add nothing to the fuel tank that is not designed for the purpose. People who pour whatever they have at hand (motor oil, atf, gasoline additives (yes, some do!)) simply add to the profits that repair shops (such as mine) make. It is a big buck job to replace the injector pump, you dno't want to do it any more than necessary.
NOW IF YOU BELIEVE THIS OR NOT IS A DIFFERENT STORY.
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Old 11-21-2007, 10:44 AM
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10-4, i copy.
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Old 11-21-2007, 11:52 AM
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I would only use motor oil if there were no source for diesel fuel. The ULSD that we use today still has a high lubricity property to it. Use diesel fuel only, that is why it is printed on the fuel filler door or on the fuel cap itself. It's not lying.
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Old 11-21-2007, 11:57 AM
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so run straight ULSD or add some Diesel kleen. I'm on board with that. Just wondered why these old truck drivers would add 1qt oil per fuel tank. Eithe way... I don't care. just wondered. My wallet like the idea of running just straight diesel.
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Old 11-22-2007, 04:27 PM
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A lot of that doesn't apply to the 7.3 or 6.0, though. We don't have injection pumps. We have hydraulic injectors fired by a high pressure oil pump. Yes, the injectors are sensitive, but nowhere near the degree that a system with a traditional injection pump is. Plus, the injectors are relatively cheap for stock ones. I've seen 7.3 injectors on ebay as low as 70 bucks. I've seen 6.0 ones for around 150 or so.
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Old 11-22-2007, 04:36 PM
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Quote:
Originally Posted by ST PowerKore View Post
....The ULSD that we use today still has a high lubricity property to it. Use diesel fuel only, that is why it is printed on the fuel filler door or on the fuel cap itself. It's not lying.
Quote:
Originally Posted by tech10002 View Post
A lot of that doesn't apply to the 7.3 or 6.0, though. We don't have injection pumps. We have hydraulic injectors fired by a high pressure oil pump. Yes, the injectors are sensitive, but nowhere near the degree that a system with a traditional injection pump is. Plus, the injectors are relatively cheap for stock ones. I've seen 7.3 injectors on ebay as low as 70 bucks. I've seen 6.0 ones for around 150 or so.
How can you say that? 6.0L's were tossing injector o-rings when LSD was around (500ppm Sulfur Content) ULSD is 15PPM.... Thus your main lubrication property has been cut by 97%. Tossing in 2-cycle oil, while not highly recommend, would be better than running straight ULSD (from a lubrication standpoint only). Just because we have HPOP systems does not meant that we shoudl throw luberication issues to the wind. HPOS are only for fuel delivery and not for anything involving injector lubrication.... Take a 6.0L and a 5.9 Cummins, running straight ULSD w/o any additive and I would bet that the 6.0L tosses an injector o-ring before the Cummins will... It’s just a massive fatal flaw with the 6.0L... They lack sufficient lubrication of vital fuel components.

Where are you shopping for your injectors? Cores are around 200, and thats the lowest ones I've ever seen in my life.. 150 might be good for a Common rail motor but not anything running HUEI.

Last edited by Sciulli; 11-22-2007 at 04:48 PM.
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Old 11-22-2007, 05:11 PM
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not that i agree with the practice but..... its not just old truckers i recently changed jobs and the company i did work for is a national trucking company "im a cdl driver" they run 750 semis coast to coast and have their own maintaince and fueling at their terminals and that is what they do with oil from the oil changes they add it to the underground fuel storage tanks when the tankers come in to deliver fuel i do not know what quanity they used as their mix but i know they add the used oil to the fuel im sure the fuel system on the big cat engine they run are different than our ps but just passing this knowlege on take it how you want i dont add oil to my fuel i use diesel kleen
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