I get the same MPG now as I got pre ULSD. I don't recall ever hearing any MPG decrease reports following the introduction of ULSD. How in the H E double hockey sticks does 1 quart of anything dilluted into 30 gallons of fuel magically make 2 additional MPG's? IMHO --- I call Barbara Streisand -- Extra lubrication? What the heck does diesel fuel lubricate?? Fuel is pumped, pressurized, and sprayed above all the rotating friction inducing components. It "lubricates" NOTHING that would improve MPG's! A well lubricated fuel system can not improve MPG's
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edited 03/01/12 12:58am by ArcticDodge *
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ArcticDodge wrote: I get the same MPG now as I got pre ULSD. I don't recall ever hearing any MPG decrease reports following the introduction of ULSD. How in the H E double hockey sticks does 1 quart of anything dilluted into 30 gallons of fuel magically make 2 additional MPG's? IMHO --- I call Barbara Streisand -- Extra lubrication? What the heck does diesel fuel lubricate?? Fuel is pumped, pressurized, and sprayed above all the rotating friction inducing components. It "lubricates" NOTHING that would improve MPG's! A well lubricated fuel system can not improve MPG's
I am guessing the injector pump requires over 1.5 HP to drive on most any diesel engine. If you cut the friction by a fraction MPG could improve by a fraction due to less friction perhaps?
To expect any real increase in HP/MPG might be better realized if one also beleives in the Easter Bunny.
I just use the WM TCW3 to keep down injector pump noise. I think moving to T6 Rotella Synthetic helped with engine noise as well.
All noted improvements were subjective in nature since no noise level measurements were made before or after and lubication changes.
Recently had glow plug work done to my 7.3 by a middle aged diesel mechanic, who has found problems with diesels others and computers couldn't(got the gift) anyway he adds to his truck each month 1 can 2 cycle oil, 1 can of seafoam,and 1 bottle of lucas products for lubrication.The issue these days is not so much water in the fuel but the quality of fuel and it don't matter who the supplier is. We have found that fuel filters must be changed twice as often as 5-10 years ago. Maybe the quality of the fuel is the reason the MPG is lower. Can't understand it price goes up and quality goes down.
Another thing just had my 6.0 work truck serviced, have used Rotella since new. Ford recently sent out a TIA that only some kind of purple full synthetic oil should be used. Might want to check on this.
I have been using the Marvel Mystery Oil (which is rated # 17) but based upon the ratings, I am going to switch to the Super Tech Outboard 2-cycle TC-W3 oil (which is rated # 7) for the added lubrication and cheaper price per tank. Thanks for the information. I already use Rotella so the fuel additive is all I need to change. Excellent post and discussion(s).
Jim
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In years past, before the tough emission regulations went into effect, Cummins had an option on some of their OTR diesels that would slowly inject lubricating oil from the crankcase into the diesel injection system. Been a long time ago but I think it was to extend the oil change interval because, the dirty oil would be replaced with clean oil slowly by replenishing oil in the crankcase. So adding oil to the fuel is fine in the older diesels. The reason for two stroke oil is because it is formulated to be diluted and still retain lubricity, and that is proven to work when diluted with diesel by testing. Another reason for two stroke oil is because it is low ash or ashless which doesn't cause abrasives when it is burnt in the combustion process. Older injection pumps were designed for the extras lubrication properties inherent in pre ultra low sulphur fuel and need some help in staying lubricated. I don't know that it helps for sure, but I use it in my VP44 pump Dodge.
The 2 stroke oil works in older diesels, but cannot be used in any of the 2007 or newer motors (someone please correct if I have the year wrong here, I know there is a date point at which due to mechanical issues, the 2 stroke oil should not be used.)
The Diesel Place.com site did a study of the various diesel fuel additives meant to add lubricity to diesel fuel. Result are found here.
The study was done a few years back now, but is still relevant. The 2 stroke oil was #7 in effectiveness in their list of additives tested.
The known incompatibility based on established science is Bosch CP 4 series of pumps, which started in the Ford 6.7 and GM Duramax in the last year.
Whether the CP3 pump, with its lower pressures is an issue is not known.
I would not put much weight on that study, which is first, old, and second, used a simplified version of the testing regime specified in ASTM D975 --- which was so concerned with the validity of their tests that they flagged it in the document.
We know very little about what happens to diesel fuel additives at the temperature / pressure they are now experiencing in the field except to know that the standard test temperatures are just nowhere close.
One would have to be extremely risk loving to put 2 stroke oil in their post 2003 model year engine.
Buy a reputable brand of lubricity improvers (eg sold by Ford, GM, and certified for their engines), if you are so inclined.
Scientific evidence of common lubricating oil additives being reactive with modern Diamond Like Carbon coatings used in high pressure fuel injection pumps like the Bosch CP 4 is found here:
Quote: High levels of sulfur in diesel are harmful for the environment because they prevent the use of catalytic diesel particulate filters to control diesel particulate emissions, as well as more advanced technologies, such as nitrogen oxide (NOx) adsorbers (still under development), to reduce emissions. Moreover, sulfur in the fuel is oxidized during combustion, producing sulfur dioxide and sulfur trioxide, that in presence of water rapidly convert to sulfuric acid, one of the chemical processes that results in acid rain. However, the process for lowering sulfur also reduces the lubricity of the fuel, meaning that additives must be put into the fuel to help lubricate engines. Biodiesel and biodiesel/petrodiesel blends, with their higher lubricity levels, are increasingly being utilized as an alternative.
The refining process, not the sulfur content, is the reason for decreased fuel lubricity.
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