oil change in the fluid coupling - Toyota Land Cruiser, 4.7 l., 2003

I changed the oil in 104 thousand km (although in the manual it was necessary to change it in 80 thousand), the unpleasant knock disappeared when starting off in the clutch, and the car Went! or so it seems to me. but it's nice when the oil was drained, it was black like a transmission. I bought 5 cans I don’t regret, after the 4th oil only began to take its original color, so the fifth can was filled in.