auto tranny fluid in the tank? - Ford Powerstroke Diesel Forum
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post #1 of 11 Old 08-13-2010, 06:35 PM Thread Starter
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auto tranny fluid in the tank?

buddy of mine told me he put atf in his tank to lube the injectors and stuff. you can do this? what does it do? dangerous? i guess he does it

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post #2 of 11 Old 08-13-2010, 06:39 PM
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I wouldn't do it a bottle of diesel keen is only like 6.00 I have heard some do it and other say not to. But to me its not worth having to replace the injectors or orings. I think it is acting as a lube since the ULSD doesnt have any lubrication

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post #3 of 11 Old 08-13-2010, 06:44 PM
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I don't think its bad. But ATF is pretty expensive. So far i've tried Power Service Diesel Fuel Supplement and 2-stroke oil. I gained roughly 1.5 MPG's just by adding them. Truck definitely runs smoother. I'd rather run those than ATF mostly because of cost.

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post #4 of 11 Old 08-13-2010, 08:05 PM
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post #5 of 11 Old 08-13-2010, 08:11 PM
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Nothing wrong with ATF… I used it on both of my 7.3’s and I would fill the oil filter housing when changing fuel filters. The engine would fire right up, with not even a puff of smoke. There are other choices..

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post #6 of 11 Old 08-13-2010, 08:23 PM
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When you change fuel filters you can fill up the fuel bowl like he said with atf. It primes the system and cleans out the injectors that first go round.


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post #7 of 11 Old 08-14-2010, 03:13 PM Thread Starter
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hmm so fill up the fuel bowl eh? that wouldnt screw up the fuel igniting right? you saying the atf will burn like a fuel and keep the motor running? or is it still pretty mixed with diesel?

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post #8 of 11 Old 08-14-2010, 04:25 PM
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Almost every fuel filter I change I prime with ATF. Especially on the IDI 7.3. Primes the filter and starts up quick. And ATF has detergents in it. It also works just like diesel.
But if you fill the bowl with it then turn the key on and "WTS" then the bowl is a diesel/ATF mix since the light takes a little bit to turn off. If you crank right away then it's mostly ATF. Doesn't hurt anything. Just don't run straight ATF ALL THE TIME

Ok I take back all the time. I don't wanna start that debate. Lord knows there's PLENTY of those out there. So let's not really touch that one


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post #9 of 11 Old 08-14-2010, 04:50 PM
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On the obs trucks, the bowl will not prime till you crank it. If its atf in there, it will stay atf till you crank the engine. Imo the farthest I would go is 2 stroke oil, not atf. Atf is very gritty and lubricates very poorly, compared to other lubricants, such as oil.

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post #10 of 11 Old 08-14-2010, 05:06 PM
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By priming I mean filling a filter with a fluid before the pump for that fluid does it. Such as priming an oil filter. Oil is in it before the oil pump ever pushes any to it. Same with a fuel. Filling it with diesel/ATF before the pump (mechanical or electric) pushes diesel into it.
Why do you say ATF is gritty and lubes poorly?


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