Just got the Vitamin “B12” notice on the maintenance minder. I had the oil and filters, and went ahead and changed the oil and filter @27K. While I was under there, I went ahead and changed the transmission fluid...even though I had already done it once already (back about 10K miles due to mountains and towing). Had to drop the skid plate for that, but while I had the truck on ramps and jack stands (to level it), I thought, what the heck. Transmission fluid would be due soon anyway. I recently replaced the air and cabin filters, so I should be good to go for a few more miles. Transmission fluid wasn’t bad looking, but could tell it wasn’t as good as new, slightly darker than new fluid.