So since I'm using PS and 2 cycle in my 97 Dodge with a quart of ATF every other month to clean the injectors, I'm dooming my rig?
It's only got 271,000 miles and I want it to last at least another 300-400K.
That's like saying, "It's a model made before catalytic converters so it'll run good on regular gas."
Your 12-Valve 5.9 is exponentially more forgiving regarding what you can and cannot do regarding fuel.
