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I have a Buddy that buy's a new GMC diesel pickup every year. Same dealer, model, reg cab, 4x4, long box, white. Same old beat up treated 4x8 plywood in the bed. He most likely puts on 8,000 miles max. I am sure the trucks never see 70mph. One oil change before he trades it in. He's been doing this for maybe 20 years.
He pours half a quart of ATF in his tank every other fill up. He claims it keeps the injectors clean.
Personally, I think this is a really really old OTR truck drivers trick that is not required with the new engines, todays diesel fuel, and with the commercial additives that are out there today. I never use additives unless my motor seems to lose power after a fill up of bad fuel. Then I'll put in a quart of whatever Cetane/injector aditive I can find. All the brands seem the same to me.
But, my Buddy swears by the ATF.
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It is an old OTR trick to keep the engine running smooth, not needed in todays electronically controlled injection systems though. It was mainly for the injection pump itself, not the injectors.