Originally Posted by ApocalypseJeep
I just got off the phone with my mad scientist who fixed my head, and he told me to absolutly not run the ATF and oil mixture for more than 50 miles. I take his advise to heart being that the guy has a whole man cave of drag and circle track racing trophies.Also said to take it real easy, keeping the revs low if possible. What do you guys think? He's not exactly a Jeep guy, but 50+ years in experience is hard to argue.
I agree with him completely. I mentioned this in my first post on the topic - that I am not a fan of adding snake oil. You might be better off just letting the motor fast idle in the driveway for the time you have the ATF in there. At no load, IOW idling, there is very little stress on the main and rod bearings since the motor does not have to generate much HP to simply idle. Once you drive the vehicle, it is another story.
To answer your other questions, high revs do not build oil pressure since the oil pump has a pressure relief valve. As soon as the pressure hits 40 psi, the valve dumps any extra pressure and you can rev it to 10,000 rpm and the pressure will be 40 psi. The only exception is a very cold (winter) start where the oil is thick from temperature and you might see 50 psi until the oil gets warm.
The idea of the ATF is to help dissolve the crap that is in there as ATF is a good cleaner. Same for MMO or Seafoam. They are to help dissolve, not a high pressure soap, so it is really not necessary to run high rpm or high pressure for them to work.
If you are going to do this, add one quart without draining any oil and just let the motor idle at 1,000 rpm. Then drain and refill with a good quality synthetic. If the noise is still there when you refill it, just drive it: hopefully the ATF will have taken some away from that blockage and with regular driving it will come out.