We just completed a 2500 mile road trip through New Mexico and Colorado. I recently started using an app along with an OBD-II reader to monitor vehicle stats. The entire way there, the ATF temp was reading at least 205-210 and would get to 245 or so going up or down the steep passes. The temp for the CVVT temp would be about the same. The last day when we were returning the temp was 195-200 while we were decending in elevation. Internet research makes me think the trip up was pretty hot for a transmission, so it seems the stock cooler can't keep up. Has anyone installed an aftermarket cooler? I did a couple drain and fills of it a couple months ago and the fluid was really dark. Is this normal? The transmission was replaced under warranty at 42k miles and I performed the drain/fill operations at about 97k and 99k, which is under the 60k mark for severe driving conditions. The first time I drained it, more fluid came out than went back in to the proper fill level.