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Discussion Starter #1
has anyone ever heard of using used and old filtered transmission fluid as an additive? My buddy works with a guy who drives a 6.0L Powerjoke and he adds a couple gallons of used filtered transmission fluid to his tank and supposedly he's getting better fuel mileage as well as a little break cause he can get the used stuff free. anyone ever heard of this kind of additive?? thanks
Jack
 

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Any type of transmission fluid, whether it's used or new should not be used in a fuel system. Modern transmission fluids contain special friction modifiers and chemical components which resist thermal breakdown and aid in extreme pressure situations. They are engineered NOT to burn under extreme heat conditions. Even 2-cycle oil is a better choice than ATF considering what's in the two and how they're intended to work. Using ATF was something that started back when diesels were able to run on just about anything that would push through the injectors. Today, diesel engines and their fuel systems operate under extremely tight tolerances. The ultra-high pressures associated with today's fuel injectors push the fuel and additives in the fuel to their limits even when they are specifically designed to run in those extreme environments. Anything introduced into these types of systems that ISN'T designed to burn or combust under heat and pressure should be avoided. Hope this helps.
:thumbsup
 

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has anyone ever heard of using used and old filtered transmission fluid as an additive? My buddy works with a guy who drives a 6.0L Powerjoke and he adds a couple gallons of used filtered transmission fluid to his tank and supposedly he's getting better fuel mileage as well as a little break cause he can get the used stuff free. anyone ever heard of this kind of additive?? thanks
Jack
Yeah man, it’s not really a good idea. Your buddy is slightly better off then any of the Cummins people because of International HUEI injection system. A comparable dodge, with a 5.9 CR would not run correctly (over the long haul). In the end the Cummins and the International would share the same issues with mechanical performance and reliability.
 

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The only engines that I've heard that may be able to burn a small amount of ATF is the 12V. But then you also need to worry about the stuff thats in the ATF that when it gets by the rings and mixed in to your oil it will slowly hurt the internal parts of the engine.
 

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Discussion Starter #5
alright thanks for the input guys definitely not wanting to risk reliability. Especially Workhorsediesel that makes total sense so I will inform my buddy's coworker that if he wants to keep his powerjoke he should probably stop
 

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I believe trans oil (auto) is also really good at coking up injectors. (leaving deposits around the orifices where the fuel sprays out)
 

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Any type of transmission fluid, whether it's used or new should not be used in a fuel system. Modern transmission fluids contain special friction modifiers and chemical components which resist thermal breakdown and aid in extreme pressure situations. They are engineered NOT to burn under extreme heat conditions. Even 2-cycle oil is a better choice than ATF considering what's in the two and how they're intended to work. Using ATF was something that started back when diesels were able to run on just about anything that would push through the injectors. Today, diesel engines and their fuel systems operate under extremely tight tolerances. The ultra-high pressures associated with today's fuel injectors push the fuel and additives in the fuel to their limits even when they are specifically designed to run in those extreme environments. Anything introduced into these types of systems that ISN'T designed to burn or combust under heat and pressure should be avoided. Hope this helps.
:thumbsup
Thank you I couldn't say it any better...:thumbsup
 

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a buddy of mine is running filtered used ATF in his 06--- 50/50 used ATF and diesel
 

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ATF is perfect in waste oil burners for heating, but only as a mix with old used motor oil. Never tried full strength. Would never burn in my Cummins 5.9.
 

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I use the ATF to fill the filters after a change or clean with NO problems ever but this is a small amount...
 
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