Nope, I'm 45 and I read a lot of modern stuff about fuels, oils, etc. And, yes, I AM running MMO/ATF in all of my vehicles, after reading of Gary's experiences.
The F250 is finished with the MMO/ATF now, and it is even smoother than it was before.
My wife's '95 Explorer is halfway through a tank of MMO/ATF now and you can barely perceive it idling in neutral, a BIG improvement.
And, my '76 C20 is also about halfway through a tank of MMO/ATF, and it is running well, too, although it was already running well before. I used the MMO/ATF in it because the intake manifold (an Edelbrock Performer RPM) came warped and I didn't realize it until I noticed that the truck was using a LOT of oil. We finally tracked it down to the intake and I had it machined flat. While it was off, I noticed to my chagrin that there were significant carbon deposits on the intake valves (and presumably in the combustion chambers, as well). So, after bolting the manifold back on, and making sure that the oil usage problem has been fixed, I'm now cleaning the intake valves and combustion chambers.
Anyway, I've had no problems whatsover with the MMO/ATF combo; I HAVE had, however, marked improvement in two of my vehicles, the ones with around 100,000 miles on them (the C20 only has 5,500 miles on the engine).
Back to the Rotella 5W-40: this is obviously a match made in heaven for the F250. Even before the MMO/ATF, it was MUCH smoother at startup, and as I've done all of these cleaning routines with additives in the fuel, the mileage just keeps improving. My most recent tank was 8.7 mpg, a new high for me with this truck.
I hadn't even thought of Rotella 5W-40 until I asked what oil I should use in this truck in this forum, and I followed the suggestions. I am very happy with this oil.