I wouldnt worry to much about it till you start making over 375 rwhp and 450rwtq. My allison has been fantastic so far. Of course when I am not at the track this truck get pampered more than a 2 year old. I have Mobil 1 in everything on this truck...front diff, rear diff, crank case, tranny, even have synthetic in the transfer case. I change the spin-on Allison filter with every oil change which I do every 2500 miles whether it needs it or not. And there has never been anything less than 93 octane in this truck since the day I bought it new. Guess what I am saying is if you take care of your truck, it will take are of you.....cliche i know, but true.