Do it now. Don't wait. There's no upside to waiting.Still no problems with tranny? I bought my 2013 LX570 four years ago 46,000 miles (CarMax shipped from Florida to Nevada) 78,000 miles now, all hot climates and I off road in Nevada. I think I should change trans fluid but uneasy reading so many posts. Toy and Lexus dealers don't want to do it.