MY15 D4 at 60,000km update
I am looking into a simple drain and refill without pan/filter change. Fair bit cheaper and I think an effective balance between cost and proactive maintenance. Plan to do same again but with pan/filter change as well at around 120k. This plan gives relatively fresh fluid at approx 60k intervals but not full flush. From what I've read of 8 speed fluid changes they all seem to be in good condition at least visually when drained.
I've towed a 1.7t (loaded) camper trailer about 20k km and the other 40k not towing.
Scott