Maxlife can definitely handle 30k no problemDefinitely was not often enough. I usually service those every 15-20K, which is about as long as you can go without experiencing shudder issues. Fluid is usually quite dark by that point.
On the later models, the code usually pops up by 25k.
Comes out the same colour.
Dw-1 just can't handle the heat-friction those big vehicles put into the 6 speed.