It looks like I'm getting a new 4L60E again for my van. Not from the same shop as last time. This one will be off-the-shelf, with a shift kit and hardened sun shell from a shop that does those things as standard practice. I assume that I can just take them a couple of cases of ATF and they'll use it rather than whatever bulk stuff they have. So what would you use? Mobil 1? Amsoil? SuperTech? j/k about the SuperTech, it's probably what they have in bulk anyway. I wouldn't spend $10 a quart for motor oil, but ATF is going to be in use a lot longer, so I don't mind spending a few bucks.